Recycling binsApril 18, 1906: The San Francisco Earthquake causes the destruction of most of the growing city. The quake's damage is considerable, but far worse is the impact of fires caused by severed gas lines and haphazard emergency response.

April 18, 1977: In a nationally-televised speech, U.S. President Jimmy Carter talks energy conservation: "We simply must balance our demand for energy with our rapidly shrinking resources. By acting now, we can control our future instead of letting the future control us."

April 18, 2008: 28 percent of respondents to a Gallup Poll say that they have made "major changes" in their lifestyles in the name of protecting the environment. 17 percent say they have made no changes whatsoever.

April 18, 2009: Breaking with years of official denial, the U.S. Environmental Protection Agency formally declares that greenhouse gas emissions are a public health threat.

Photo: orphanjones/Flickr

This feature is compiled by Peter Dykstra, an MNN contributor and publisher of Environmental Health News and The Daily Climate.