Scientists propose 9 limits on human actions: Wrecking ozone, over-using fertilizer, killing species could block key “ecosystem services.” Are there natural limits to fresh water use and pollution?
The ozone layer protects Earth from UV rays: Twenty-two years after a treaty to protect ozone, how is the layer doing? What has happened to the ozone hole above Antarctica?
A new study finds a surprising number of fish, birds and mammals in the oceans 100 and 1,000 years ago. Can this information help regulators slow the decline of important marine animals?
What does science tell us about dealing with money? Can thinking about money change your behavior? How do monkeys gamble? Is ‘homo economicus’ truly rational? Do some people thrive on financial risks?
After World War II, the “green revolution” sparked an explosion in farm output in developing countries. With soaring food prices and spreading food riots, what can we learn from the green revolution?
Pilot errors have dropped 40 percent over 20 years, but on-the-ground accidents have increased. Why have pilot errors declined? What work remains to increase airline safety?
Plug-in hybrids mean more than just extra spending cash for drivers, though. They could offer a new path through the maze of the electric grid, and help to boost the use of alternative energy.
Hybrid cars and fuel cells increase auto efficiency and reduce pollution, but it’s a long struggle from the idea to the reality.
Using a chemical reaction that changes color when specific chemicals are present, a new “dipstick” may detect spoilage better than the human nose.
What would happen to the global climate after a nuclear war between India and Pakistan? Study says the planet would be dark and cool for 10 years. How much would food production decline?