The World Was Just Issued 12-Year Ultimatum On Climate Change

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But it means ensuring temperatures don't rise more than half a degree.

More than 2,500 were killed in India when temperatures reached highs of 48 degrees between May and June three years ago.

The IPCC report said,"At +1.5°C, twice as many mega cities as present such as Lagos in Nigeria and Shanghai in China are likely to become heat stressed, potentially exposing more than 350 million more people to deadly heat stress by 2050".

A major report announced that a drastic, "unprecedented" effort by the world's governments is needed to limit global warming to 1.5 degrees Celsius.

The consequences of a 1.5°C rise include extreme temperatures in many regions across the world, increases in frequency, intensity and/or amount of heavy precipitation, and an increase in intensity or frequency of droughts in some regions.

The IPCC calls for massive investments in renewable energy to meet climate-change goals, claiming that avoiding a catastrophe will involve "annual average investment needs in the energy system of around $2.4 trillion" between 2016 and 2035.

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".

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A landmark United Nations report paints a dire picture of the catastrophic consequences the world will face if immediate action is not taken to limit the global warming to 1.5°C, warning that at 2°C, the world could see 10 cm more global sea level rise, loss of all coral-reefs and worsening food shortages.

It said, "Climate-related risks for natural and human systems are higher for global warming of 1.5 degree C than at present, but lower than 2 degree C. These risks depend on the magnitude and rate of warming, geographic location, level of development and vulnerability, and on the choices and implementation of adaptation and mitigation options".

While much has been said about the need to limit global warming temperatures - what exactly is the difference between 2C and 1.5C and how does it impact the world?

By 2050, they will need to reach "net zero" - any further CO₂ emissions due to human activity would then have to be matched by deliberate removal of CO₂ already in the atmosphere, including by planting trees.

Strengthening the capacities for climate action of national and sub-national authorities, civil society, the private sector, indigenous peoples and local communities can support the implementation of ambitious actions implied by limiting global warming to 1.5°C.

Delaying action on climate change "is something that is explicitly contradicted in the report", he told the Thomson Reuters Foundation.

The report makes it clear that climate change is already happening - and what comes next could be even worse, unless urgent global political action is taken.

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The Scottish government published its draft Climate Change Bill earlier this year, which upped a 2050 target for reducing greenhouse gas emissions from 80% to 90% against 1990 levels.

"We are already seeing the consequences of 1°C of global warming through more extreme weather, rising sea levels and diminishing Arctic sea ice, among other changes", said Panmao Zhai, co-chair of one of the IPCC Working Groups. The sea level will still rise, and there always be more extreme weather events and natural disasters, but these won't be as extreme as the worst case scenario we're now headed for. "If action is not taken it will take the planet into an unprecedented climate future".

At this point, in fact, the report said that even if global change and worldwide cuts in Carbon dioxide emissions were to begin immediately, it would only delay, not prevent, the impeding global warming.

It furthers the Paris Agreement of 2015, where and aim of limiting global temperature rises to "well below" 2C was set.

But they asked the IPCC to complete a report on the feasibility to limiting hikes following a request from small island nations.

Most worryingly, the IPCC's report claims that this 1.5°C increase could be reached in as little as 11 years, and nearly certainly within 20 years. "The next few years are probably the most important in our history", she said.

Scientists have long warned that mankind should limit warming to 2 deg C to avoid catastrophic climate change.

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