- Seas would rise almost 4 inches (0.1 meters) less.
"This poses a tremendous challenge to us as a species, since it means we need to completely revolutionise the way in which we generate energy on the planet". It also does not describe any risks except for destabilization of the Greenland and West Antarctic ice sheets, he said. Most coral reefs will die, which could trigger rippling effects throughout the oceans. "We're going to grow", Trump said at the time.
Limiting warming to 0.9 degrees from now means the world can keep "a semblance" of the ecosystems we have.
The IPCC report downplays the real costs of climate change, and its contribution to natural disasters, because it can be hard to tease out the exact role of human-caused climate from a hurricane or other disaster, said Kevin Trenberth, a senior scientist in the Climate Analysis Section at the National Center for Atmospheric Research.
In 2017, he announced that he was pulling the United States from the landmark Paris Agreement on climate change. At 2C global warming, Botswana would warm by 2.8C, and Namibia by 2.7C. The new report offered a look at the the consequences of a 2.7 degree rise.
The landmark Paris Agreement adopted in December 2015 by 195 nations at the 21st Conference of the Parties to the UN Framework Convention on Climate Change (UNFCCC), included the aim of strengthening the global response to the threat of climate change by "holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre-industrial levels". The 1.5 was at the urging of vulnerable countries that called 2 degrees a death sentence.
The report highlights a number of climate change impacts that could be avoided by limiting global warming to 1.5°C compared to 2°C, or more.
Over 90 scientists from 40 different counties collaborated on the climate change report, examining more than 6,000 scientific studies.
The burning of fossil fuels on an industrial scale has raised global temperatures by about 1 degree Celsius (1.8 degrees Fahrenheit).
Vimont said that this could lead to more extreme weather in the local area going forward. Tom Udall said the US must heed its "urgent warning" and "take decisive action to halt climate change in concert with other nations". That is the big global target. He likened the report to an academic exercise wondering what would happen if a frog had wings. "They were specifically charged with the task of determining the feasibility of NZ transitioning and they show that decarbonising without massive dislocation is quite possible" he said.
Limiting warming to the lower goal is "not impossible but will require unprecedented changes", United Nations panel chief Hoesung Lee said in a news conference in which scientists repeatedly declined to spell out just how feasible that goal is. That shows the degree of confidence they have in their predictions, he said.
As Pogo once said "We have met the enemy and he is us".
This would demand rapid, comprehensive and unprecedented changes in all aspects of the society, said IPCC chairman Hoesung Lee at the dialogue. Annual carbon dioxide pollution levels that are still rising now would have to drop by about half by 2030 and then be near zero by 2050. Switching away rapidly from fossil fuels like coal, oil and gas to do this could be more expensive than the less ambitious goal, but it would clean the air of other pollutants.
The IPCC report advice that life needs to be altered on three fronts-changing the mode of transportation, mode of residence and dietary practice.
Though the fallout of global warming would cut across the world, India and its adjoining regions are projected to be the worst victims of it.
Meeting the tougher-to-reach goal "could result in around 420 million fewer people being frequently exposed to extreme heat waves, and about 65 million fewer people being exposed to exceptional heat waves", the report said. "In any event, the Paris Agreement requires party countries' ambitions to become stricter every five years".
The outcome will determine whether "my grandchildren would get to see lovely coral reefs", Princeton's Oppenheimer said. "One opportunity for African countries to adapt may be to collaborate more closely, for example, by enhanced schemes to trade food, and transport water and energy between countries", he says.