Climate Change

What is the impact of thinner ice on polar bears?

Thinner ice leads to shorter hunting times for seals, which affects polar bears' ability to catch them.

How much weight have male polar bears near Hudson Bay lost over the past 45 years?

Male polar bears currently weigh 150 pounds less than they did 45 years ago.

What ecological role do polar bears play?

Polar bears are apex predators, hunting seals and leaving carcasses for other animals.

What is the greenhouse effect?

The greenhouse effect is the process by which certain gases trap heat in the Earth's atmosphere, regulating temperature.

Name three greenhouse gases (GHGs).

Water vapor (H2O), carbon dioxide (CO2), and methane (CH4).

What is the average temperature of Earth with greenhouse gases?

The average temperature is approximately 14°C (57°F).

What would the average temperature of Earth be without greenhouse gases?

Approximately -18°C (0°F).

How is the concentration of CO2 in the atmosphere measured?

In parts per million (ppm).

What is the current concentration of CO2 in the atmosphere as of 2012?

400 ppm.

What is Global Warming Potential (GWP)?

GWP is an estimate of how much a molecule contributes to global warming over 100 years relative to CO2.

What are the natural sources of carbon dioxide (CO2)?

Volcanic eruptions are a significant natural source of CO2.

What is the largest natural source of methane (CH4)?

Wetlands are the largest natural source of methane.

What human activities contribute to greenhouse gas emissions?

Fossil fuel combustion, landfill emissions, deforestation, and agricultural practices.

What percentage of human-caused CO2 emissions comes from burning fossil fuels?

94% of all human-caused CO2 emissions.

What is the relationship between CO2 levels and global temperatures?

Changes in CO2 levels and global temperatures are linked; when one rises, the other typically rises as well.

What is the significance of the Industrial Revolution on CO2 levels?

The last 50 to 100 ppm of CO2 added since the Industrial Revolution is causing significant climate disruption.

What is the process of denitrification related to nitrous oxide (N2O)?

Denitrification occurs in wetlands and contributes to the release of nitrous oxide.

What are chlorofluorocarbons (CFCs)?

CFCs are human-made greenhouse gases that contribute to global warming.

What is the primary source of anthropogenic methane emissions?

Agricultural practices, including livestock and rice paddies, contribute significantly to methane emissions.

How does coal compare to oil and natural gas in terms of CO2 emissions?

Coal produces the most CO2 per unit of energy, while natural gas produces the least CO2.

What is the origin of fossil fuels?

Fossil fuels are formed from the remains of ancient plants and animals subjected to heat and pressure over millions of years.

What is the role of evaporation in the natural greenhouse gas cycle?

Evaporation from oceans and water bodies contributes to water vapor, a natural greenhouse gas.

What is the impact of human respiration on CO2 levels?

Human respiration contributes approximately 1.4 to 2 billion tons of CO2 per year.

What was the highest recorded level of CO2 in April 2025?

431.13 ppm

For how long has the atmosphere contained more than 300 ppm of CO2?

Over 800,000 years

What year was recorded as the hottest year on record in 2023?

2023

What significant trend has been observed in global temperatures since 2010?

The 10 warmest years have all occurred during the last decade (2014-2023).

What are two consequences of global warming related to ice?

Melting of polar ice caps and melting of glaciers.

What is one implication of rising sea levels due to climate change?

Drowning of island nations and coastal cities.

How does climate change affect agriculture?

It alters crop seasons and the regions where certain crops can be grown.

What is one way individuals can reduce CO2 emissions related to car usage?

Avoid idling your car.

What dietary change can significantly reduce greenhouse gas emissions?

Switching to a plant-rich diet.

What is the estimated CO2 reduction from reducing food waste by 2050?

88.5 gigatons

What role does education play in climate change mitigation?

It leads to improved livelihoods and better economic opportunities, slowing population growth.

What is the CO2 reduction potential of tropical forest restoration by 2050?

54.45 gigatons

What is one of Project Drawdown's top solutions for climate change?

Refrigerant management to prevent leaks.

What is the CO2 reduction potential of onshore wind turbines by 2050?

46.95 gigatons

What is the significance of utility-scale solar photovoltaics?

They produce electricity at the scale of a power plant.

What are two actions individuals can take to reduce greenhouse gas emissions?

Switch from fossil fuels to renewable energy sources and increase fuel efficiency.

What is a consequence of shifting global ocean circulation patterns?

Negative implications for Europe and other countries.

What is the impact of climate change on bird migration?

Alteration of timing for bird migration and flowering.

What is the CO2 reduction potential of clean cooking by 2050?

31.38 gigatons

What is one way to increase carbon sequestration?

Stop cutting down trees.

What is the CO2 reduction potential of distributed solar photovoltaics by 2050?

26.65 gigatons