* FAO says deforestation of world's biggest forests slowing

* Agriculture and population pressure still a big threat

BRAZZAVILLE, June 1 (Reuters) - The rate of destruction of the world's three largest forests fell 25 percent this decade compared with the previous one, but remains alarmingly high in some countries, the U.N. Food and Agriculture Organisation said.

Areas where food supplies could be worst hit by climate change have been identified in a report.

Some areas in the tropics face famine because of failing food production, an international research group says.

The Climate Change, Agriculture and Food Security (CCAFS) predicts large parts of South Asia and sub-Saharan Africa will be worst affected.

Its report points out that hundreds of millions of people in these regions are already experiencing a food crisis.

As the U.S. sees increased severity and frequency of hurricanes and tornadoes, there is perhaps no timelier reminder that the world's cities face devastating impacts from climate change.

CHILDREN LINE UP for hot dogs and orange juice at a project run by Save the Children in Parys, South Africa. Virtually everywhere, infant mortality is down and life expectancy is up.

Stepping into the public square to announce that foreign aid is important and effective can be lonely work. As someone who has attempted to make that case over the past decade, I can assure you that the world is often eager to hear just the opposite.

But aid money can and does work. It improves people's lives and makes the world a better and safer place.