This short video - on an FAO roots and tubers project in Ethiopia - is FAO's contribution to a Rio+20 mini-campaign by UNISDR, the Geneva-based UN office for disaster risk reduction.

In this Episode of Hungry Planet: Rising sea levels and increasingly severe storms threaten millions of farmers living along Bangladesh's southern coast, increasingly unpredictable weather patterns in Chad fuel hunger and, in Ethiopia, distribution of high yield root and tuber varieties help farmers increase production in times of drought.

Rio+20 must result in a change of mind-set. We can no longer afford to ignore the interdependencies between natural resources, the environment, hunger and malnutrition. Sustainable agricultural and food systems that make efficient use of our natural resources must become the basis of tomorrow's economy. And with sufficient political will and vision, agriculture can help us achieve the sustainable future we want: a world without hunger.

Deforestation and forest degradation in developing countries account for nearly 20% of green house gas emissions worldwide, which is why estimating and reducing these emissions has become a key goal for the international community as the Rio+20 conference on sustainable development in June draws closer. One country attempting to do just that is Tanzania, currently in the process of drawing up a comprehensive inventory of its forests to help the East African country better manage its natural resources. More than a third of Tanzania is forested, but almost 1% of that forest is being lost annually. The inventory will measure how much carbon is stored within Tanzania's forests and will help the country to understand the role it can play in mitigating climate change.

In southern India, the climate is becoming unpredictable and drought more common. Indiscriminate pumping from shallow aquifers shared by many farmers has caused abnormal drops in water levels. When a well goes dry, a farmer loses his crop. Six thousand farmers have been trained in groundwater management by a project run by Indian NGOs and guided by the UN's Food and Agriculture Organization. They have learned to monitor how much water is available underground at the start of the growing season. Then they only plant crops that need that much water.