Although an economic boon, tourism can be a destructive force for the environment. Israel, filled with religious tourism destinations, is exploring ways to make pilgrimages sustainable.
Around the world 1.3 billion tons of food is wasted every year. A more efficient food supply is a key to feeding an expected world population of 9 billion by 2050.
Delegates at the Rio+20 earth summit must look beyond CO2 to black carbon. Reducing black carbon (soot) is easier than reducing other kinds of greenhouse gas emissions. And a market-based international system to reduce carbon emissions is already in place.
Political differences, the worldwide financial crisis and a divergence of priorities among rich and poor countries are barriers to an agreement on a future negotiating path accordig to UN Secretary-General Ban Ki-moon.