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What's new in the latest US climate assessment

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WASHINGTON – Global warming now affects the United States more than ever and the risks of future disasters – from flooding along the coasts to damage failure in the Midwest – could pose a deep threat to the well-being of Americans.

This is the core of Volume 2 in the latest national climate assessment, a report of 1

,656 pages issued on Friday, which explores both current and future climate impact. The scientific report, published every four years as requested by Congress, was produced by 13 federal authorities and released by the Trump Administration.

This year’s report contains many of the same results as cited in the previous national climate assessment, published in 2014. The temperature is still rising and the odds of dangers that fires in the West continue to increase. However, reflecting some of the consequences that have been known throughout the country over the past four years, some of the report’s emphasis has changed.

Predicted Effects Have Occurred

More and more of the predicted effects of global warming now become a reality.

For example, the 2014 assessment was estimated that coastal cities would see more flood in the coming years when sea levels rose. It is no longer theoretical: Researchers have now documented a record number of events in high tide floods in cities such as Miami and Charleston, SC

. Flooding floods now pose daily risks to companies, neighborhoods, infrastructure, transport, and ecosystems in Southeast Asia, “said the report.

As the oceans have heated, disturbances in US fishing are long foreseen, now and again. During 2012, record temperatures caused lobster catches in Maine to spike a month earlier than usual, and the supply chain was unprepared.

Everything is bound

The report proposes another approach to assessing the effects of climate change, considering how different effects – on food supplies, water and electricity production, for example – interact with each other.

“It is not possible to fully understand the impacts of climate change in the United States without considering interactions between sectors and their consequences,” the report says.

It provides several examples, including recently dried in California and elsewhere as combined with population changes affecting demand for water and energy. The report also cites Superstorm Sandy, six years ago, which caused cascaded impact on interconnected systems in the New York area, some of which were not expected. Floods of subways and highways, for example, did harder to repair the electrical system that suffered widespread damage.

In addition to the boundaries

The United States military has long taken climate change seriously, both for its potential impact on troops and infrastructure around the world and for its potential to ] cause political instability in other countries. [19659006] The report cites these international problems, but goes far beyond the military. Climate change already affects US companies’ foreign business and supply chains, and as these effects worsen, it will take a trade and economy fee.

Global warming and natural disasters also affect the development of less-favored countries. The report says, adds additional burdens to the United States for humanitarian aid and disaster relief.

Adaptation, Adaptation, Adaptation

Since 2014, more detailed economic research has estimated that climate change could cause hundreds of billions of dollars in annual injuries, such as deadly heat waves, coastal waters, and an increase in extreme weather taking its toll. In order to limit this damage, communities must take steps to prepare in advance.

The previous assessment warned of getting states and cities taking measures to adapt to climate change. It slowly changes, the new report finds. More and more communities take measures such as preserving wetlands along the coasts to serve as buffers against storms.

However, in some places in Louisiana and Alaska, few coastal environments rethink their development patterns to avoid the effects of rising seas and difficult weather as reported by the report will certainly come.

The report warns that the country is particularly unprepared for the upheavals that will arise as rising sea levels of coastal coastal cities: “The potential need of millions of people and billions of dollars for coastal infrastructure to be moved in the future creates challenging legal, economic and capital issues that have not yet “

A focus on air quality

While much of the discussion on climate change looks at the role of carbon dioxide and other greenhouse gases on heating the planet, the report puts a renewed emphasis on the effects of other air pollutants such as ozone and smoke, which can cause respiratory tract and lead to premature death.

The report highlights the fact that climate change increases ozone levels, as rising temperatures and changes in atmospheric circulation affect local weather conditions. But the increases will not be uniform. By the close of the century, the worst ozone levels will be across a wide area of ​​the Midwest and Northern Great Plains, while levels are expected to improve, at least somewhat, in parts of the southeast.

The report repeats which residents in the West have learned from difficult experience: the warmer springs, longer dry seasons in the summer and other effects extend the season. The smoke from fires does not only affect health, says the report but its visibility.

For more news on climate and environment, follow @NYTClimate on Twitter .


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