“It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century,” the document says.

“For the warming over the last century, there is no convincing alternative explanation supported by the extent of the observational evidence.”

Reports suggested there was concern among scientists that the report by the National Oceanic and Atmospheric Administration might suffer from political interference from the White House. Instead, the scientists said there was none.

The Associated Press said the 447-page report, one of two scientific assessments required every four years, is the most comprehensive summary of climate science since 2013.

Climate change might be worse than thought after scientists find major mistake in water temperature readings

During the election campaign and since assuming office, Mr Trump has rejected much climate change science as “a hoax”. Earlier this year, he withdrew the US from the Paris Accord, placing the country alone with Syria as the two nations that have refused to be part of it.

“A lot of what we've been learning over the last four year suggests the possibility that things may have been more serious than we think,” said Robert Kopp of Rutgers University, one of the dozens of scientists inside and outside the government who wrote the studies.

Since 1900, the earth has warmed by 1C degree and seas have risen by 8 inches. Heat waves, downpours and wildfires have become frequent, the report noted.

Lisa Murray's climate change photography Show all 12 1 /12 Lisa Murray's climate change photography Lisa Murray's climate change photography Dinka cattle herders starting their migration in South Sudan Lisa Murray Lisa Murray's climate change photography A Dinka woman fetches water in South Sudan Lisa Murray Lisa Murray's climate change photography Veronica in South Sudan preparing tea outside her home, recently ravaged by heavy flooding Lisa Murray Lisa Murray's climate change photography Children playing in Vietnam. When it floods, transport to and from school is a major challenge Lisa Murray Lisa Murray's climate change photography Sugeng, a fish and crab farmer from Indonesia who suffers financially every time the area floods Lisa Murray Lisa Murray's climate change photography Tan, a vegetable farmer, learning new methods through Oxfam in Vietnam Lisa Murray Lisa Murray's climate change photography Maluk, a 19-year-old from Tonj South, South Sudan Lisa Murray Lisa Murray's climate change photography Normally this farmer in South Sudan would be harvesting sorghum, but rains are late so the hunger season continues Lisa Murray Lisa Murray's climate change photography Herders bringing home their cattle in Afar, Ethiopia Lisa Murray Lisa Murray's climate change photography Farmers harvesting chilli in Ethiopia Lisa Murray Lisa Murray's climate change photography A woman in Tigray, Ethiopia, scares birds away from her crops with a slingshot Lisa Murray Lisa Murray's climate change photography Irula tribe woman in Tamil Nadu Lisa Murray

Energy Secretary Rick Perry and Environmental Protection Agency chief Scott Pruitt, have repeatedly said carbon dioxide is not the primary contributor to global warming.

Yet, the scientists who wrote the report said it was extremely likely - that is, to a level of certainty between 95 to 100 per cent - that global warming was man-made, mostly from the spewing of carbon dioxide into the atmosphere from the burning of coal, oil and natural gas.

For the first time, scientists highlighted a dozen “tipping points” of potential dangers that could happen from warming, things that co-author Katharine Hayhoe of Texas Tech University, said “keep me up at night”.