A tractor applies conventional ammonia fertilizer on a field in eastern Washington.

Ammonia has been widely used as a fertilizer for the last century. Now, using renewable energy and a new method for making ammonia, researchers and entrepreneurs believe "green" ammonia can become a significant clean fuel source for generating electricity and powering ships.

By Nicola Jones

Climate

Climate Clues from the Past Prompt a New Look at History

As scientists rapidly improve their ability to decipher past climate upheaval through ice cores and other "proxies,” historians are re-examining previous political and social turmoil and linking it to volcanic eruptions, prolonged droughts, and other disturbances in the natural world.

By Jacques Leslie

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OPINION

Protecting Earth: If ‘Nature Needs Half,’ What Do People Need?

The campaign to preserve half the Earth’s surface is being criticized for failing to take account of global inequality and human needs. But such protection is essential not just for nature, but also for creating a world that can improve the lives of the poor and disadvantaged.

By Carl Safina

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