Countries are already seeing an increase in extreme weather and rising sea levels as a result of the increase in average global temperatures of 1 degree above pre-industrial levels that has already occurred, the IPCC study said.
The assessment was released after three years of research and a week of tough negotiations between scientists and government officials at a meeting in South Korea.
Keeping the 1.5C target would keep the global sea level rise 0.1 meter (3.9 inches) lower by 2100 than a 2C target, the report states.
Earth is on track to face devastating consequences of climate change - extreme drought, food shortages and deadly flooding - unless there's an "unprecedented" effort made to reduce greenhouse gas emissions by 2030, a new United Nations report warns.
The cost? Investments in clean energy totalling US$2.4 trillion (S$3.3 trillion) are needed every year from 2016 to 2035, and coal-fired power cut to nearly nothing by 2050.
Moreover, "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".
"Every extra bit of warming matters, especially since warming of 1.5C or higher increases the risk associated with long-lasting or irreversible changes, such as the loss of some ecosystems", the IPCC's Hans-Otto Portner said.
Unless African governments take swift action against global warming, millions of people in the continent are in danger of being pushed into poverty and hunger.Oxfam International, an amalgamation of 20 non-governmental organisations (NGOs) working with partners in over 90 countries to end the injustices that cause poverty, raised the alarm yesterday.
Watch SpaceX's first West Coast ground landing at 10:21PM ET
The rocket launched the SAOCOM 1A satellite into orbit and then the rocket landed back on the west coast. The rocket will be carrying an Argentinian Earth-observing satellite, known as SAOCOM-1A, into orbit.
Green Car Reports respectfully reminds its readers that the scientific validity of climate change is not a topic for debate in our comments.
- To limit warming to 1.5C, net emissions of carbon dioxide would need to fall by about 45% from 2010 levels by 2030, reaching "net zero" around 2050. At least 70 percent of electricity supply will need to come from renewables by 2050 to stay within the 1.5C limit, compared with about 25 percent now.
Former George Tech atmospheric-sciences professor Judith A. Curry described the report's conclusions as the "same old, same old", based on questionable climate models and not "new science or better ways of assessing uncertainty".
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.
"The next few years are probably the most important in our history", said Debra Roberts, co-chair of the IPCC working group that addresses impacts, adaptation, and vulnerability, in the statement.
Campaigns Manager Gail Wilson said: "Climate change is the biggest threat to the planet and everyone that lives here".
Greens climate spokesman Adam Bandt said the report showed it was "time to hit the climate emergency button", and neither major party was prepared to take the necessary steps.