The grass pea is one: a hardy crop that can thrive in a drought. An agriculturist is spearheading an effort to diversify what farmers grow as climate change threatens staples like corn and wheat.

An agreement allowing Ukrainian grain to ship through the Black Sea has been extended for two months just a day before its expiration — overcoming Russia's threats to pull out of the deal.

That's the view of Joseph Glauber of the International Food Policy Research Institute. He considers the fear the war would lead to a surge in food prices – and a dramatic worsening of world hunger.

Farmers in Ukraine begin to harvest this year's wheat, barley and rapeseed crops as diplomats try to negotiate an end to Russia's Black Sea blockade of exports.

Last year, the region imported more than 36 million metric tons of wheat, mostly from Russia and Ukraine. The concern is that Russia's war in Ukraine could disrupt supplies and drive up prices.