While there have been very few bad effects of the HUGE output of human fossil fuel burning since WW2, the biosphere just LOVES IT!
One of the fundamental flaws of Global Warming (see sidebar) is that it is always bad. Here is the biggest, seldom mentioned, good, effect of “Climate Change”.
If you are a greenhouse farmer you can increase your yield dramatically by burning fossil fuels in your greenhouses to increase the CO2 concentration to over 1000ppm.
The same thing is happening to the whole planet…
CO2 fertilisation has increased maximum foliage cover across the globe’s warm, arid environments – Donohue – Geophysical Research Letters – Wiley Online Library
 Satellite observations reveal a greening of the globe over recent decades. The role in this greening of the ‘CO2 fertilization’ effect – the enhancement of photosynthesis due to rising CO2 levels – is yet to be established. The direct CO2 effect on vegetation should be most clearly expressed in warm, arid environments where water is the dominant limit to vegetation growth. Using gas exchange theory, we predict that the 14% increase in atmospheric CO2 (1982–2010) led to a 5 to 10% increase in green foliage cover in warm, arid environments. Satellite observations, analysed to remove the effect of variations in rainfall, show that cover across these environments has increased by 11%. Our results confirm that the anticipated CO2 fertilization effect is occurring alongside ongoing anthropogenic perturbations to the carbon cycle and that the fertilisation effect is now a significant land surface process.