Bio-energy The report says biofuels compete for land and water with food crops and are inefficient. They can cause deforestation and damage soils and water.
Biotechnology The use of GM crops, where the technology is not contained, is contentious, the UN says. Data on some crops indicate highly variable yield gains in some places and declines in others.
Climate change While modest temperature rises may increase food yields in some areas, a general warming risks damaging all regions of the globe. There will be serious potential for conflict over habitable land.
Trade and markets
Subsidies distort the use of resources and benefit industrialised nations at the expense of developing countries.
So basically if we start doing things the way the environmentalists and lefties in general have been suggesting for the past 60 years then we’d be fine.