Citrus growers know that the number of fruit in their current crop has an inverse effect on the number of flowers in the return bloom.

VOA: special.2009.11.10

The crop losses will have the most effect on the world's poorest populations.

CNN: Extreme heat and droughts -- a recipe for world food woes

That is understandable when drought or deluge can destroy their crop, but it has the effect of reducing yields.

ECONOMIST: Insuring crops with a mobile phone

Yet the use of artificial fertilisers increases crop yields and so what is the net effect?

FORBES: The Climate Vulnerable Forum Report: Really Not Very Good At All