There's more than one way but irrigation would be a start.
Irrigation has been one of the factors that has been used extensively to increase food production. In many parts of the world the depletion of aquifers, and the global warming reduction in glacier fed streams is reducing our ability to do as much as we have been doing.
Petros said, " Why would it be allowed to expand? Haven't Brazil, Argetina, Colombia, Venzeula, Peru, Equador, Panama, Costa Rica or any other good damn places that tries to feed it's people by cutting down some trees been chastized over land use over the past 30 years and still hasslled today? "
Except that restrictions on agricultural lands are different from restrictions on forestry, or valuable ecosystem land. Countries that are restricting deforestation for a whole variety of reasons are being rewarded now as well. Some are getting breaks on loan repayments, some are getting aid packages that include agriculture, forestry, tourism, etc.