University of Arizona produces another global warming food scare

wryheat

A recent paper from the University of Arizona claims “Grasses across the globe may be unable to keep pace with a changing climate, threatening some of the world’s most critical food sources, according to new research by University of Arizona ecologists.”

The study compared “past rates of niche change in 236 species of plants in the grass family with projected rates of climatic change by 2070, the team led by Alice Cang and John Wiens found that the rate of future climate change may dramatically outpace the capabilities of grasses to change their niches and survive.” (Read press release here and the full paper here.)

I see two problems with the claim:

1) Past rates of niche change reflected existing conditions at the time and does not prove that plants cannot adapt at a faster rate if they had to. The authors admit this deep in the paper.

2)…

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South Australia’s blackout apparently ‘triggered by the violent fluctuations from the Snowtown wind farms’

Watts Up With That?

Performance of wind farms and fossil fuel powered generators analysed

Snowtown Wind Farm - Image: Trustpower Snowtown Wind Farm – Image: Trustpower

Guest essay by Tom Quirk

It looks like a natural disaster but brought on by the fragility of the South Australian power system caused by the size of the variations in wind power.

The failure is most likely to have been triggered by the violent fluctuations from the Snowtown wind farms (Figure 1 and 5). Shortly after 3 pm there was a loss of 200MW with a partial recovery some twenty minutes later of 100MW. The total wind farm supply for South Australia also shows these variations (Figure 2).

This would have put a shock to the system for frequency stability at 50 cycles per second. For most of the day the local gas fired generators were only supplying 100 MW (Figure 3) with the balance to match demand with supply coming from Victoria…

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