INTRODUCTION TO ENVIRONMENTAL SCIENCE

Introduction to Environmental Science

Environmental science aims to understand, analyze, and solve environmental problems using scientific methods and ethical principles.
Environmental studies also fosters environmental awareness, literacy, and citizenship among the people, which are essential for environmental action and advocacy.

John Muir (late 19th/early 20th century): A naturalist and writer who helped establish Yosemite National Park and founded the Sierra Club. He is considered the "Father of the National Parks" for his advocacy for wilderness preservation.
Aldo Leopold (1949): Wrote A Sand County Almanac, which introduced the concept of the "land ethic." This philosophy argues that humans should view themselves as part of a community that includes the land, not separate from it.
Rachel Carson (1962): Published Silent Spring, a book that brought awareness to the dangers of pesticides, especially DDT (dichloro-diphenyl-trichloroethane), to the environment. Her work is often credited with launching the modern environmental movement.
Garrett Hardin (1968): Described the "Tragedy of the Commons," an economic theory where individuals acting in their own self-interest deplete a shared resource, even when it's not in their long-term best interest. This concept is used to explain many environmental issues.
James Lovelock (1970s): Proposed the "Gaia Hypothesis," which suggests that living organisms and their inorganic surroundings on Earth are part of a single, self-regulating system that maintains the conditions for life.

Hardin’s parable involves a pasture "open to all."
Imagine the grazing of animals on a common ground.
Individuals are motivated to add to their herds to increase personal wealth out of their own self-interest and short-term gain.
Every animal added to the total degrades the commons a small amount.
Although the degradation for each additional animal is small, the gain in wealth for the owner is greater.
Each owner gets the benefit of adding to his herd (more milk, meat to sell).
Each owner shares the cost of the depletion of the pasture (less grass and more soil erosion).
Adding more animals makes sense economically to the farmer.
As selfish stewards, each owner adds another to their herd and the pasture. If all owners follow this pattern, the commons will ultimately be destroyed.
The use of the commons gives the farmer (or corporation) all of the benefits but none of the responsibility or cost for the degradation, called an EXTERNAL COST or externality.
As a result, the pastures were overgrazed, polluted, and degraded to the point that they were no longer able to support any cattle.
This failure to preserve the natural resource for short term gain and self interest is known as "the tragedy of the commons."

Environmental science is the study of how humans interact with the environment.
It is a highly interdisciplinary field, drawing from biology, chemistry, physics, geology, and even social sciences like economics and political science.

Concepts and understanding it through an interdisciplinary lens.
Analyzing human impact on the issue and how we can provide solutions or innovations.

Biology: Focuses on the impact of rising temperatures on ecosystems and living organisms. This includes habitat loss, changes in migration patterns, extinction of species (e.g., coral bleaching), and the spread of diseases.
Chemistry: Explains the greenhouse effect at a molecular level. Certain gases, like carbon dioxide ( $\text{CO}_2$ ), methane ( $\text{CH}_4$ ), and nitrous oxide ( $\text{N}_2\text{O}$ ), have a chemical structure that allows them to absorb and trap infrared radiation, preventing it from escaping into space and warming the atmosphere.
Politics: Involves the local, national, and international governance of climate change. It addresses the challenges of creating and enforcing agreements (e.g., the Paris Agreement), the role of different nations, and the political will to implement policies and regulations to reduce emissions.

Sustainability:
- The ability to meet the needs of the present without compromising the ability of future generations to meet their own needs. It involves balancing environmental, social, and economic factors.
- Example: A company that uses renewable energy sources and practices ethical waste management to reduce its environmental impact while maintaining profitability is acting sustainably.
Carrying Capacity:
- The maximum population size of a biological species that can be sustained by a specific environment, given the available resources like food, water, and space.
- Example: The carrying capacity of a forest for deer is determined by the amount of vegetation available for them to eat. If the deer population exceeds this capacity, some deer will likely starve.
Ecological Footprint:
- A measure of humanity's demand on nature (measured in global hectares). It quantifies the amount of land and water area a human population requires to produce the resources it consumes and to absorb its wastes.
- Example: A person living in a developed country with a high consumption of meat, frequent air travel, and a large home has a larger ecological footprint than someone in a developing country who relies on public transport and a plant-based diet.

"We have a lot of issues that need awareness and solving. IF WE WILL NOT BE AWARE OR LEARN, WE CANNOT DO ANYTHING!"