Edith M. Lederer

UNITED NATIONS (AP) — With the bang of a gavel, international leaders approved an ambitious 15-year plan Friday to tackle the world's biggest problems, from eradicating poverty to preserving the planet to reducing inequality.

Tia Ghose

The consequences of global sea level rise could be even scarier than the worst-case scenarios predicted by the dominant climate models, which don't fully account for the fast breakup of ice sheets and glac

Elsa Wenzel

Verbose. Indecipherable. Incroyable. Those are just a few ways to describe the dizzyingly complex COP21 climate negotiations in Paris this year.

Mark Anderson

Gaelle Gourmelon

It’s not easy to keep track of the complex ways in which our everyday choices have an impact on a global scale. But as the world’s population surpasses 7 billion, each of our actions—positive or negative—gets multiplied.

Heather Stewart

World leaders gathering at the UN in New York next weekend must pledge to make a revolutionary effort if they are serious about meeting the 17 ambitious anti-poverty targets for 2030 that they are due to sign, according to Britain’s leading development thinktank.

Damian Carrington

Curbing the world’s huge and increasing appetite for meat is essential to avoid devastating climate change, according to a new report.

Oliver Milman

Humans are "eating away at our own life support systems" at a rate unseen in the past 10,000 years by degrading land and freshwater systems, emitting greenhouse gases and releasing vast amounts of agricultural chemicals into the environment, new research has found.

Randall Hackley

In a world in which 14 percent of the population in the 21st century still defecate outdoors, children remain among the most vulnerable to a lack of toilets, contamination from human waste and dirty water.

As the demand for freshwater and energy increases in San Diego County and Northern Baja, the fresh water supply continues to shrink while energy generation remains heavily dependent on fossil fuels. Due to these opposing trends in supply and demand, it becomes increasingly imperative to identify solutions that move these communities to their preferred state in which they are largely reliant on renewable energy and use water sustainably. Large-scale energy solutions include wind power, one of the must abundant sources of energy in these regions.