has anyone informed Tim of the Sydney dam leveles lately. Oh that rotton computer models.

http://www.recoveringgrace.org/

'Humanity's impact on nature, they say, is now comparable to the five previous catastrophic events over the past 600 million years'

how can people write this garbage. To think we have people who make livings out of the taxpayers by preaching such blind faith.

I think estimates vary so wildly because reasons are being spun to make money from donations, grants and even preposterous development.
Take the present situation of Sydney's Warragamba Dam about to spill over, while Sydney's end of the world water desalination plant sits idle costing millions of dollars to maintain while mothballed.
http://www.smh.com.au/nsw/535m-paid-to-keep-desalination-plant-in-state-of-hibernation-20150410-1miuw6.html
and
http://www.smh.com.au/environment/weather/sydney-weather-warragamba-to-spill-trigger-nepean-hawkesbury-flooding-20150826-gj83n7.html

Extinction is not in the news these days. Neither is news about the ongoing and increasing cost of the desal plant.