Sometimes, growing two crops simultaneously on the same piece of land — called intercropping — can benefit farmers. But it needs careful planning and resource management.

Nearly 80% of Americans believe temperatures are definitely on the rise. Yet, very few members of the general public understand the key role that no-tillage will play in battling global warming over the next 90 years.

Nearly 80% of Americans believe temperatures are definitely on the rise. Yet, very few members of the general public understand the key role that no-tillage will play in battling global warming over the next 90 years.

The next Green Revolution must be guided by small-holder no-till farmers, adapted to local circumstances and sustainable for the economy and the environment, said Microsoft founder and chairman Bill Gates to a crowded hall at last week's World Food Prize Borlaug Dialogue in Des Moines.

Developing emissions markets to encourage farmers in poor countries to store more carbon dioxide in no-till soil should be a key topic on the U.N. climate talks agenda, global warming activist Al Gore said.