Speaking before an enthusiastic crowd at a sold-out DAR Constitution Hall in Washington, D.C., former Vice President Al Gore issued a challenge to "repower America." Gore's challenge is undoubtedly ambitious: he wants the entire U.S. electricity sector to shift to zero-carbon sources like wind, solar, and geothermal in the next 10 years.

The impacts of climate change are already being felt, especially in the most fragile and marginal ecosystems around the world. In particular, coral reefs, which are extremely sensitive to changes in the temperature and acidity of the water in which they form, are being destabilized by a changing ocean environment. Several scientific studies have demonstrated that many of the world's coral reefs are precariously close to total failure. A new study, while confirming this conclusion, does offer some hope.

March 28, 2008, saw the launch of China's Ministry of Environmental Protection (MEP). As stated in its mission, this new cabinet-level ministry will take responsibility for China's environmental governance. MEP is tasked to develop and organize the implementation of environmental protection; to manage all related planning, policy and standards; and to coordinate across jurisdictions and levels of government to solve the country's major environmental problems.

Most discussions around international climate change—the Kyoto Protocol, the Lieberman-Warner Bill introduced on the floor of the U.S. Senate last month, and the G8 discussions taking place this week—include targets for emissions of carbon dioxide (CO₂) and other greenhouse gases (GHG). A more direct question was addressed at the Tallberg Forum in Sweden last week: regardless of emissions, how much CO₂ can actually accumulate in the Earth's atmosphere without causing enormous and irreversible impacts on human society and the natural environment?

To the list of air pollution's health effects, add another one: loss of sense of smell.

Mexico City residents can't detect subtle smells as well as residents of neighboring Tlaxcala, researchers at Mexico's National University (UNAM) have reported, though the regions are quite similar in both culture and climate. The primary difference: Mexico City has much higher levels of air pollution.

As the Olympic Games approach, China has come under fire for its environmental track record. Tales of Beijing and other cities' infamous pollution and images of highly polluted lakes and rivers have met with demands for action, both within China and internationally, and have produced some meaningful results. Yet another environmental crisis looms: biological invasions. Indeed, while perhaps not as overt as choking smog or pea-green water, the ecosystems of this vast nation are increasingly threatened by invasive species.

The global campaign to eradicate malaria in the 1950s and '60s successfully vanquished the disease from the United States and Europe and substantially reduced it in others – in India and Sri Lanka, for instance, malaria cases decreased by 99 percent. Malaria transmission was nearly wiped out in the subtropics, and it was significantly reined in in parts of the Soviet Union, Latin America, and Asia.

About the insecticide that served as a cornerstone of the campaign, the National Academy of Sciences wrote in 1970: "To only a few chemicals does man owe as great a debt." But the same insecticide has become one of today's most infamous chemicals. It is DDT.

The earthquake that struck Sichuan Province on May 12, 2008 was China's most damaging earthquake since the 1976 Tangshan earthquake disaster. Sichuan, a province in western China, has been historically known as the "Land of Abundance" (Tian Fu Zhi Guo), as it is one of the major agricultural production bases of China.

The most immediate concerns after such a disaster are human casualties, injury, and property destruction. However, earthquakes and other natural disasters wreak substantial environmental damage, with consequences for human health and economy as well as biodiversity and resource availability.

Economic accounts and social indicators have aided policymaking in both the public and private sectors for many decades. Here at EarthTrends, we catalogue information about more than 200 countries more than 700 different ways, with numbers showing population levels, energy consumption, economic growth, and ecosystem health.

However, some of the most critical data for good policymaking are not collected or reported in any meaningful or systematic way.

Trash is a pervasive but unnoticed part of our lives. The great irony of waste management is that even the most efficient and well-run waste collection programs remain out of sight, ignored by the public that they serve. Only with failure does the omnipresence of trash really come to light. Today, many nations face a looming waste management crisis, as their landfills reach capacity and continue to degrade the environment. But new and innovative waste-collection and construction techniques – far cries from the dirty incinerators and vast landfills of the past – can help to reduce waste volume and minimize environmental and health impacts.