Produced by 91 authors at the request of the group of governments which signed on to the 2015 Paris Agreement, it outlines the impact of global warming of 1.5 degrees Celsuis above pre-industrial levels, and puts forward suggestions to contain global warming below that.
This would mean replacing petrol and diesel cars with electric vehicles or other clean alternatives and scrapping the use of gas boilers in homes in just a few decades.
The US delegation - the first since Donald Trump took office to work on an IPCC report - did not throw a monkey wrench into the process, as many here had feared.
Jerry Brown declared the world "must radically change" and "must decarbonize and establish a totally renewable basis for all economic activity" in reaction to a new United Nations report on climate change.
The global temperature is now 1°C warmer than pre-industrial levels.
More frequent or intense droughts, such as the one that almost ran the taps dry in Cape Town, South Africa, as well as more frequent extreme rainfall events such as hurricanes Harvey and Florence in the United States, are also pointed to as expectations as we reach the warming threshold.
That could reduce flooding and give the people that inhabit the world's coasts, islands and river deltas time to adapt to climate change. "And what we don't understand is that our ecosystems, on which we survive on land and in the oceans, are experiencing this more severely".
The World Coal Association disputed the conclusion that stopping global warming calls for an end of coal use. Coral reefs would nearly entirely disappear with 2 degrees of warming, with just 10-30% of existing reefs surviving at 1.5 °C.
Neither Premier Ford nor Mr. Kenney have yet said what policies they would employ to cut emissions, or whether they support Canada's objective of reducing greenhouse gas emissions by 30 per cent below 2005 levels by 2030 - a commitment made under the Paris accord.
Using carbon capture and storage (CCS) technology, the share of gas-fired power would need to be cut to 8 percent and coal to under 2 percent. Among them, sea level rises would be around 48cm if the temperature was 1.5C and 56cm for 2C.
There is some good news. The Paris agreement set out to prevent warming of more than 3.6 degrees above preindustrial levels - long considered a threshold for the most severe social and economic damage from climate change.
The IPCC's Special Report on 1.5 degrees celsius shows that global carbon dioxide emissions must be halved by 2030 before falling to net zero by mid century at the latest.
This report shows the longer we leave it to act, the more hard, the more expensive and the more unsafe it will be.
"Twenty-40% of the global human population live in regions that, by the decade 2006-2015, had already experienced warming of more than 1.5°C above pre-industrial in at least one season". Coral reefs would decline by 70-90% with global warming of 1.5 degrees, whereas more than 99% would be lost with 2 degrees. The problem with even a slight shift in goals is that the scientific work done in advance of the global talks hadn't provided results for a 1.5°C scenario.
In reality, it seems far more likely that the world will "overshoot" the 1.5 degree mark, causing irreversible harm. Even 1.5°C comes with serious consequences. Working Group I assesses the physical science basis of climate change; Working Group II addresses impacts, adaptation and vulnerability; and Working Group III deals with the mitigation of climate change.
Keeping the 1.5C target would keep the global sea level rise 0.1 metre lower by 2100 than a 2C target, the report states.
Yesterday, the United Nations released a terrifying report about climate change, which basically said we've got around 12 years left to keep climate change to a minimum.
Quick guide What difference would restricting warming to 1.5C make? "There's certainly things that we'll need to invest in more to develop the next generation of solutions". About as you'd expect: by referring to strategies to reduce emissions as "all that nonsense", and dismissing the UN's comprehensive evidence and warning as "some sort of report".
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