Rachel Carson's book Silent Spring, published in 1962, raised public awareness about the dangers of pesticides and other pollutants to the environment and human health. It is widely credited with helping to launch the modern environmental movement.

The Stockholm Conference on the Human Environment was the first major international conference to address environmental issues. It brought together representatives from 113 countries and resulted in the adoption of the Stockholm Declaration and Action Plan, which called for international cooperation to address environmental problems.

The United Nations Framework Convention on Climate Change (UNFCCC) is an international environmental treaty adopted at the Rio Earth Summit in 1992. It sets out a framework for international cooperation to address climate change.

The Kyoto Protocol is an international agreement that aims to reduce greenhouse gas emissions. It was adopted in 1997 and came into force in 2005. The protocol sets binding targets for industrialized countries to reduce their greenhouse gas emissions.

China is the largest emitter of greenhouse gases in the world, accounting for about 28% of global emissions. The United States is the second largest emitter, accounting for about 15% of global emissions.

Global warming is the term used to describe the long-term increase in global average surface temperatures. It is caused by the release of greenhouse gases into the atmosphere, which trap heat and cause the planet to warm.

Sea level rise is the gradual increase in the average sea level. It is caused by the melting of glaciers and ice sheets, as well as the thermal expansion of seawater as it warms.

Biodiversity loss is the term used to describe the loss of plant and animal species. It is caused by a variety of factors, including habitat destruction, pollution, climate change, and overexploitation.

Agriculture is the main cause of deforestation. Forests are cleared to make way for crops and livestock grazing. Logging, mining, and urbanization also contribute to deforestation.

Deforestation is the term used to describe the process of converting natural areas into agricultural land. It is a major cause of environmental problems, including climate change, biodiversity loss, and soil erosion.

Overgrazing is the main cause of desertification. When livestock graze on land too heavily, they can damage the vegetation and soil, making it more susceptible to erosion. Deforestation, climate change, and pollution also contribute to desertification.

Soil degradation is the process of soil becoming less productive. It can be caused by a variety of factors, including erosion, salinization, compaction, and pollution.

Water pollution is caused by a variety of human activities, including industrial waste, agricultural runoff, sewage discharge, and oil spills. These pollutants can contaminate water sources and make them unsafe for drinking, swimming, and fishing.

Air pollution is the process of introducing harmful substances into the Earth's atmosphere. These substances can include particulate matter, gases, and aerosols. Smog, acid rain, and eutrophication are all types of air pollution.

The use of chlorofluorocarbons (CFCs) is the main cause of ozone depletion. CFCs are chemicals that are used in a variety of products, including refrigerators, air conditioners, and aerosol sprays. When CFCs are released into the atmosphere, they can damage the ozone layer, which protects the Earth from harmful ultraviolet radiation.