Comprehensive Notes on Climate Change and Energy Production

Energy Choices and Security

  • Climate Change and Energy Production

    • Societies have diverse energy sources with varying sustainability, availability, cost, and socio-political implications.

    • Energy source selection is intricate and contentious.

    • Energy security is crucial in energy decisions.

  • Key Knowledge

    • Fossil fuels dominate human energy supply but differ significantly in production impacts and emissions; usage is projected to rise.

    • Low-emission energy sources (renewables like solar, biomass, hydropower, wind, and geothermal) are expected to grow.

    • Nuclear power is a low-carbon, low-emission option but raises concerns about radioactive waste and potential accidents.

    • Energy security relies on reliable, affordable energy, fostering independence; unequal access can spark conflict.

    • Energy choices are shaped by availability, sustainability, technology, culture, politics, economics, and environmental factors, influencing energy security.

    • Boosting energy efficiency and conservation can curb demand growth and bolster energy security.

  • Skills

    • Evaluate the advantages and disadvantages of diverse energy sources.

    • Explain factors influencing energy source choices across societies.

    • Discuss factors affecting energy security.

    • Assess energy strategies for specific societies.

Energy Security

  • Energy Security Importance: Nations grapple with ensuring affordable, reliable energy while maintaining national security.

  • Diversification: Governments spread risks by using multiple energy sources from various locations, including domestic ones.

  • Uneven Distribution: Fossil fuel deposits are concentrated (coal in China, oil in the Middle East, gas in Russia), forcing some nations to import.

  • Risks of Dependence: Reliance on other countries for energy can be problematic during conflicts or crises, increasing energy security risks.

Factors Influencing Energy Choices

  • Availability of Supply: Locally sourced or imported energy.

  • Technological Advancements: Discovering new energy sources and harnessing unconventional ones, like shale oil and wave power.

  • Political Factors: Can cause conflicts over energy resources or decisions to use costlier domestic options for greater security, affecting nuclear energy adoption.

  • Economic Factors: Globalization may make importing power cheaper than domestic production.

  • Cultural Attitudes: Societal preferences, like reliance on fossil fuel-powered cars, hinder shifts to sustainable alternatives.

  • Sustainability: Renewable sources, despite being sustainable, constitute a small portion of global energy supply.

  • Environmental Considerations: Public opposition to nuclear energy, as seen in Germany's phase-out post-Fukushima.

Energy Security Definition

  • The ability to secure affordable, reliable, and sufficient energy supplies for a country's needs.

Examples of Energy Security Choices

  • Ukraine-Russia Gas Disputes: Disputes over gas pricing and transit demonstrated energy security vulnerabilities.

  • USA Shale Oil: Fracking technology has allowed the U.S. to access tight oil reserves, reducing its dependence on imports.

    • Production increased from 600,000 to 3.5million3.5 {million}. barrels a day.

  • Wind Turbines in Denmark: Government support has made Denmark a leader in wind energy, reducing carbon emissions.

    • Denmark produces over 30%30\% of its energy from wind energy

Origin of Energy

  • All energy on Earth originates from the Sun, essential for climate, geochemical cycles, and life.

  • Fossil fuels are stored solar energy from ancient organic matter.

  • Burning fossil fuels releases stored carbon dioxide, impacting atmospheric levels.

Data Analysis

  • Calculate the percentage of global energy supply from fossil fuels.

  • Compare energy usage between China, the USA and India based on their population sizes.
    *Evaluate the energy strategies of different countries.

Fossil Fuel Depletion Estimates

  • Coal: Approximately 230 years left.

  • Gas: Around 170 years left.

  • Oil: About 100 years left.

  • Some predict oil depletion by 2075.

  • The Middle East holds two-thirds of known oil reserves.

  • China's increasing coal use drives rapid consumption growth.

Consequences of Increased Energy Use

  • Rising global population and increasing wealth lead to higher energy consumption.

  • Fossil fuels, formed over millions of years, are being depleted rapidly.

  • Peak oil, the point after which oil production declines, is nearing.

  • Coal is abundant but is the "dirtiest" energy source due to carbon dioxide and sulphur dioxide emissions.

Addressing the Energy Crisis

  • Transition to renewable energy sources and nuclear power is essential.

  • The EU aims to increase renewable energy use to 20% by 2020.

  • The hydrogen economy, using hydrogen as fuel, is a possibility but faces challenges in transport and storage.

  • Need to reduce energy consumption and increase efficiency.

Energy Consumption Measurement:

  • Measured in tonnes of oil equivalent (TOE).

  • World primary energy consumption grew by 1.8% in 2012.

Energy Consumption Patterns

  • Oil remains the top fuel but has a declining market share.

  • Hydroelectric and renewable energy have reached record shares.

  • Consumption per capita varies widely.

  • Asia and Oceania have seen a sharp rise in energy consumption.

Renewable Energy Potential:

  • Renewable resources could theoretically power the world, but currently, they make up a small percentage.

  • The EU aims for 20% renewable energy by 2020.

  • Investment in renewable energy research lags behind fossil fuel research.

Reasons for Slow Renewable Adoption:

  • Commitment to the carbon economy and fossil fuel infrastructure.

  • Fossil fuels are currently cheaper (ignoring environmental costs).

  • Trade agreements and convenience lock countries into current resources.

  • Renewable sources are location-dependent.

Carbon Emissions from Fossil Fuels:

  • Burning fossil fuels releases carbon dioxide, contributing to the greenhouse effect.

  • China and the US are the largest emitters.

  • Per capita emissions vary widely by country.

  • Deforestation also significantly contributes to carbon emissions.

Evaluating Energy Sources

  • Coal (Fossil Fuel)

    • Advantages: Plentiful, easy to transport, relatively cheap.

    • Disadvantages: Non-renewable, releases carbon dioxide and sulphur dioxide, causes pollution and land degradation.

  • Oil (Fossil Fuel)

    • Advantages: High heat of combustion, versatile.

    • Disadvantages: Limited supply, carbon dioxide emissions, oil spill risk.

  • Natural Gas (Fossil Fuel)

    • Advantages: High heat of combustion, cleaner than coal and oil.

    • Disadvantages: Limited supply, carbon dioxide emissions.

  • Nuclear Fission

    • Advantages: Raw materials are relatively cheap, small mass produces huge energy amount, no carbon dioxide emissions and other pollutants released.

    • Disadvantages: Extraction costs high, nuclear reactors are expensive to build and run, nuclear waste is radioactive and highly toxic for a long time.

  • Renewable Hydroelectric Power (HEP)

    • Advantages: High-quality energy output, creates water reserves.

    • Disadvantages: Costly to build, ecological impacts, siltation.

  • Biomass

    • Advantages: Cheap and readily available, sustainable if crops are replanted.

    • Disadvantages: Can replace food crops, still gives off pollutants when burned.

  • Wind

    • Advantages: A cheap and readily available source of energy, offers a long-term, sustainable energy source if the trees are replaced.

    • Disadvantages: Low heat of combustion, not much energy released for its mass, Transportation are costly as it needs a high volume.

  • Solar

    • Advantages: Minimal cost if properly designed

    • Disadvantages: Requires architects who can design for solar passive technology

  • Wind

    • Advantages: Minimal cost if properly designed

    • Disadvantages: Often windy sites not near highly populated areas.

  • Tidal

    • Advantages: It produces a lot of energy.

    • Disadvantages: Construction of barrage is very costly.

  • Wave

    • Advantages: Should be ideal for the island country

    • Disadvantages: Construction can be costly:

  • Geothermal

    • Advantages: Only works in areas of volcanic activity.

    • Disadvantages: Volcanoes might calm down, leaving power station redundant

Alberta Tar Sands

  • Extracting oil from tar sands is energy-intensive and environmentally damaging.

  • Destroys boreal forest and muskeg ecosystems.

  • Requires significant water use and produces wastewater.

Biofuels

  • Fuels made from crops (e.g., sugar cane, maize, oil palm).

  • Potentially carbon neutral but have complex carbon costs.

  • Land use for biofuels can lead to deforestation and food shortages.

Climate Change Overview

  • Climate change has been a normal feature of Earth's history, but human activity has contributed to recent changes.

  • There has been significant debate about the causes of climate change.

  • Climate change causes widespread and significant impacts.

Climate vs. Weather

  • Climate describes how the atmosphere behaves over relatively long periods.

  • Weather describes short-term atmospheric conditions.

  • Both are affected by ocean and atmospheric circulatory systems.

  • Climate is the average weather pattern over many years for a location on Earth.

Key Factors Affecting Weather And Climate

  • Clouds: Can trap heat or reflect sunlight.

  • Forest Fires: Release carbon dioxide but regrowth traps it again.

  • Volcanic Eruptions: Release ash cooling the Earth.

  • Human Activities: Burning fossil fuels and agriculture release GHGs.

Human Activities Impacting Climate

  • Increasing greenhouse gas levels lead to:

    • Increased global temperatures.

    • More frequent and intense extreme weather events.

    • Potential long-term climate changes.

    • Sea-level rise.

Distinguishing Scientific Claims from Pseudoscience:

  • Understand climate variations.

  • Differentiate between short-term and long-term data.

  • Acknowledge the complexity of climate systems.

Understanding Greenhouse Gases (GHGs)

  • There is little carbon dioxide in the atmosphere (0.04% of the total gases) but it and other GHGs are increasing through anthropogenic activities (activities of humans).

Factors affecting climate change:

  • Fluctuations in solar insolation affecting temperature.

    • Changing proportions of gases in the atmosphere released by organisms

    • The role of ozone and CFCs.

    • The role of water vapor

Global emissions:

  • Carbon dioxide: 50−60%50-60\%.

    • Methane: 20%20\%.

  • Nitrous Oxide: 4−6%4-6\%.

    • Chlorofluorocarbons: 14%14\%.

Methane Sources

  • Cattle: Release methane due to bacteria in their stomachs, which results in 100 million tons of methane per year.

  • Waste Tips: Waste tip releases methane when they decompose.

  • Rice paddies: release up to 100 million tonnes of methane per year due to anaerobic respiration by bacteria in the soil
    *Swamp and bugs: 5 millions km2 of bogs produce methane.
    *Tundra : the bogs and swamps of the tundra contain much methane produced by decomposition in waterlogged soils.

IPCC View on Climate Change:

  • 'Warming': The climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia.

  • Atmospheric concentrations of carbon dioxide, methane, and nitrous oxide have increased to levels unprecedented in at least the last 800,000 years.

  • Continued emissions of greenhouse gases will cause further global warming and changes in all components of the climate system. Limiting climate change will require substantial and sustained reductions of greenhouse gas emissions.

  • Human influence on the climate system is clear. It is extremely likely (95–100% probability) that human influence was the dominant cause of global warming between 1951–2010.

Ways in which the climate can change over time due to a change in greenhouse gas levels:

  • Direct Relationship.

  • Buffering Action. *Respond Slowly.

    • Tipping point.

    • Get stuck at a new equilibrium.

Evidence for Climate Change:

*Ice Cores
*Measurements of Atmospheric Gases

  • Rising Sea level
    *Average surface temperature increase

Impacts of Climate Change:

  • Ocean and sea level: Ocean absorb carbo dioxide and seas level re rising.

    • Polar Ice caps: As ice melts, it opens up trade routes for transport.

    • Glaciers: Loss of Glacier ice leads to floods
      *Weather patterns: The weather will be more violent and sporadic with bigger storms.

    • Ecosystems: Birds and butter flies shifted their ranges to higher latitude.

Global Dimming:

*Air Pollution: Air Pollutions affect weather

Views affecting climate change (IPCC vision):

*International commitments
*National actions
*Personal lifestyle

Difference between stabilization vs GHG Emission:

  • Stabilizing concentrations of GHGs in the atmosphere are stabilized is because human activities are adding GHGs to the atmosphere faster than natural processes can remove them

Mitigation measures:

  • Reduction of energy consumption
    *Reduction of Nitrogen oxide and Methane from agriculture
    *Carbon capture and structure

Strategies adopted to alleviate climate change:

*Migration
*Vaccination
*Manage weather