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Tim is obviously VERY ignorant. By 2050 the maximum food the Earth can produce for humans will be probably 1/3 less from AGW, maybe up to 1/3 less from lack of irrigation water and soil loss, along with world fisheries collapse, and more loss from oil depletion effects of no mechanized farming and distribution. The population of 8.5 billion will be at well below sedentary starvation level, variable with time and location. Cascading collapse in an a world that has already been in abject poverty for some time. It will start in the 2030s, but build up in effects from 2015 to then. The early 2040s will see the Ogallala Aquifer and many others depleted. The rates of soil loss and fisheries loss will hit more then, also. The TFR is , and has been lowering while population goes up by momentum, but death rates will drastically increase until they overtake birth rates and rapid die off occurs. Some think it may go down with starvation from less oil and not a steep drop off that occurs with other mammals in nature. The population of say, 2070, will be a small fraction of the peak.
Now for AETM and the ELE, sponge. It is thought by many that we are in the 6th Great Extinction right now, and it started with the human killing off of mega fauna 10K years ago. The tipping point of tundra methane self release with no more human HGHG input was believed to be at in 2009. There is also the ocean warming tipping point with Arctic Polar ice loss and the darker ocean warming more rapidly on its own. It is thought by Hansen and others that if HGHGs are not reduced 90% by 2016 to 2020, that the tundra methane tipping point will most likely be crossed, followed in time by the ocean methane hydrate self releases to "turnover" similar but greater than PETM almost 55 million years ago. The rapidity being far greater is what leads biologists knowledgeable to thinking it will be up to a 90% total species extinction rate. Anything of a time range up to 10 or 20 thousand years is,to a geologist, an "event". Anything over a 50% extinction rate is considered an Extinction Level Event, or ELE. The 30% extinction rate of PETM (in 30+K years)was not considered an ELE, or at least a "Great Extinction" "event".
PS: the UN has under scored AGW with "PC" and is off by a significant margin. Things have been far beyond their worse than worst case scenario.
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"With every decision, think seven generations ahead of the consequences of your actions" Ute rule of life.
“We do not inherit the earth from our ancestors; we borrow it from our children”― Chief Seattle
“Those Who Have the Privilege to Know Have the Duty to Act”…Albert Einstein
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