No-till farming

From NPR:

This month the Senate is set to take up the climate and energy bill that Congress began work on last spring. One provision will likely set up a system to pay farmers for something called "no-till farming."

The concept: When crops are planted without tilling, the soil holds more carbon, which means less goes up into the atmosphere.

But scientists aren't sure no-till really sequesters carbon any better than conventional farming.