troops have withdrawn from the ukrainian border. president biden says allied action will be swift if there s an invasion. every week at this time we take a look at the climate crisis bringing you stories with big implications for our planet. this week on climate critical, we focus on food how climate change is threatening food production and the planet s ability to feed itself. according to the un, more than two billion people across the globe that s nearly one in three of us are not getting enough of the right food. and one in ten more than 800 million people are chronically undernourished. on top of that extreme weather and rising sea levels have an impact on crop yields, at a time when policies to tackle climate change like planting forests and growing biofuels also mean less land to grow food on. the problem s been made worse by pollution and intensive farming practises degrading and eroding the soil.