A few facts about the world hunger:
World will need 70 percent more food by 2050;
Experts look to myriad "green bullets" to boost production;
Grassroots innovations already flourishing worldwide.
What are the solutions for food insecurity?
In flood-hit fields in the Philippines, farmers are testing a hardy new variety of rice that can survive completely submerged for more than two weeks.
In Kenya's Kibera slum, poor urban families are turning around their diets and incomes just by learning to grow vegetables in sack gardens outside their doors.
And in India, a push to help marginalised rural communities gain title to their land is leading to a significant drop in hunger.
These are just a few of the kinds of innovations and intitiatives that experts say will be critical if the world is to feed itself over coming decades as the population soars, cities sprawl and climate change takes its toll.
In the meantime, many hunger fighters say the answer lies in clever alterations to the way food is planted, watered, harvested, stored, transported, sold, owned and shared.
Many of those changes are already being tested in the world's farms and fields, in laboratories and government offices, in factories and markets. Some are even speaking of the beginnings of a 21st century food revolution.
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