Earthquakes.
air pollution
For most of human history, nature has been the most important source of environmental hazards, but in recent years human action has been overtaking nature as the greatest source of environmental hazard. With the recent disaster in Japan, we have some of each. Nature caused the earthquake, but human beings built the nuclear power plants which when damaged by the tsunami caused by the earthquake, are now a huge environmental hazard.
Double dipping is not considered to be a health hazard, it may be a health concern, but not a hazard. Most of the germs that people spread through casual contact and or saliva is not very serious and most often even helps boost people's immune systems.
The most serious environmental problem today is human apathy, laziness and greed.
A major environmental issue that Arizona has currently is having reliable water sources. Another issue is air pollution from coal industry plants.
The United States produces the most waste, pollutants, toxins, and environmental hazards. Following the United States is China, India, Russia, and Japan.
more serious and most serious
more serious, most serious
China has some very serious environmental problems. One of the most noticeable is the smog. In many of the cities the air in China is filled with pollutants that make your eyes water and cause many people to cough. China also has a lot of water pollution, with many chemicals and toxins dumped into the water every day.
I believe the answer is: The dioxine leaking from the UCAR (Union Carbide co.) installations in the city of Bhopal, back in December 1984. It was one of the most terrible industrial accidents ever.
There is one main environmental organization in Latin American. In Latin American the local environmental agencies are the most important environmental organization.
North America due to its population size, geographical area, multiple biomes, and geopolitical significance has critical environmental issues that are unresolved. Among the most serious after climate change are destruction and loss of hydrology systems due to over exploitation of finite water resources.