The Environmental Protection Agency used its authority to regulate carbon dioxide as a source of pollution and set higher standards for power plants.

CNN: Obama needs to lay out a plan on climate crisis

This will allow truckers to reduce emissions significantly (diesel emissions include nitrous oxides, particulate matter, and other air toxics and they are a major source of pollution in some areas).

FORBES: Acceleration of the Natural Gas Highway

It has led to deforestation in countries like Brazil, for instance, and, in countries belonging to the Organisation for Economic Co-operation and Development (OECD), intensive livestock production has become a major source of pollution.

UNESCO: World Water Assessment Programme (WWAP)

Coal-fired power plants are a big source of particle pollution.

FORBES: List: America's Most Polluted Cities

What was once considered noise pollution could soon become a green source of energy.

FORBES: Written by Bryan Nelson

These bills will curb lead levels in water pipes, a major source of harmful lead exposure for children, and help address diesel engine pollution that is linked to serious health conditions like asthma and heart and lung disease.

WHITEHOUSE: Council on Environmental Quality Blog

"The draft law it is really trying to tackle the issue in a proactive way, trying to tackle the pollution at its source, " said Ma Jun, a prominent environmentalist in Beijing and author of China's Water Crisis.

CNN: Beijing tries to clean up its act