Global temperatures have risen 1 degree Celsius above pre-industrial levels, researchers said, citing human activity and greenhouse gas emissions. Keeping the rise in temperature to 1.5C would mean sea levels by 2100 would be 10cm lower than if the warming was 2C, the likelihood of an Arctic Ocean free of sea ice in summer would be once a century rather than at least once a decade, and coral reefs would decline by between 70 and 90 percent instead of being virtually wiped out.
The information provided by the State Department did not address the specific findings of the report or its call for "rapid, far-reaching and unprecedented changes" to governments' policies and consumers' behaviors.
The in-depth report's title: Global Warming of 1.5°C, an IPCC special report on the impacts of global warming of 1.5°C above pre-industrial levels and related global greenhouse gas emission pathways, in the context of strengthening the global response to the threat of climate change, sustainable development, and efforts to eradicate poverty, leaves very little doubt as to what the report is about. All this would need an annual average investment of around $2.4 trillion in energy systems to move from coal to renewables between 2016 and 2035.
The UN report warns the most serious impacts of climate change could arrive as early as 2030 if carbon emissions aren't significantly reduced.
At the current rate of global warming, the world's temperatures are set to increase by another 1.5C between 2030 and 2052.
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The IPCC is the United Nations scientific body that assesses the state of climate science . For Namibia , dry days increase by 12 at global warming of 1.5°C, and by 17 at 2.0°C.
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If 1.5 degrees of warming does occur, Southeast Asian countries like Indonesia, the Philippines, and Vietnam, including countries like Japan, China, Egypt, and the USA will experience increased flooding by 2040. It envisions a scenario in which the US acts alone on climate change, not in tandem with the 194 other countries that agreed to emissions reductions in the Paris Agreement on climate change. Further, scientific projections suggest that 99 percent of the world's corals will be lost at the higher end of the temperature range whereas more than 10 percent would have a fighting chance at survival if temperatures are limited to the lower target. The longer we wait to act, the IPCC report says, the more we'll have to use this type of technology, which has never been proven at a large scale.
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.
"Limiting warming to (2.7 degrees) is possible within the laws of chemistry and physics", Jim Skea of Imperial College London, one of the authors of the report, said, "but doing so would require unprecedented changes".
"The next few years are probably the most important in human history", IPCC co-chair Debra Roberts, head of the Environmental Planning and Climate Protection Department in South Africa, told Agence France-Presse.
The report further revealed that global warming has already had an effect in regions across the world. The report was prepared in response to an invitation from the United Nations Framework Convention on Climate Change (UNFCCC) when it adopted the Paris Agreement in 2015.
Former Vice President Al Gore Jr. warned that "time is running out" after the release of a United Nations special report Sunday giving the world 12 years to head off climate calamity by radically transforming "all aspects of society".