Flooding, droughts, heatwaves and wildfires will pose a massive threat to humans in the future as climate change worsens, a major United Nations report has warned.
The report from the Intergovernmental Panel on Climate Change (IPCC) said the impact of global warming was already being felt and would increase with every additional degree that temperatures rose.
The world is in "an era of man-made climate change" and has already seen impacts of global warming on every continent and across the oceans, the report said.
And experts warned that in many cases, people are ill-prepared to cope with the risks of a changing climate.
The White House said it is taking the report as a call for action, with Secretary of State John Kerry saying: "Waiting is truly unaffordable. The costs of inaction are catastrophic."
Sao Paolo, Brazil, has been hit by drought Food security will be hit by reduced yields in wheat, rice and maize crops, while climate change will also exacerbate existing health problems, and lead to more heatwave-related deaths, malnutrition and disease, the report said.
Increasing numbers of people are set to be displaced by extreme weather events, and the impacts of rising temperatures could help increase the risk of violent conflicts by worsening problems such as poverty.
The report's publication has renewed calls from scientists and campaigners for action to cut greenhouse gases and to help vulnerable people adapt to "already-unavoidable impacts of climate change".
Vicente Barros, co-chair of the IPCC study, from the University of Buenos Aires, Argentina, said: "We live in an era of man-made climate change.
"In many cases, we are not prepared for the climate-related risks that we already face. Investments in better preparation can pay dividends both for the present and for the future."
Princeton University professor Michael Oppenheimer, one of the main authors of the 32-volume report, warned: "We're all sitting ducks."
Risks of coastal and inland flooding in UK 'is set to increase' Professor Sam Fankhauser, of the London School of Economics and a contributing author to the report, said: "In the UK and the rest of northern Europe, we will need to cope with increasing risks from coastal and inland flooding, heatwaves and droughts.
"The UK and all rich countries must also provide significant support to help poor countries, which are particularly vulnerable, to cope with the impacts of climate change."
The report is the second chapter of the fifth assessment by the IPCC, set up in 1988 to provide neutral, science-based guidance to governments.
The last overview, published in 2007, unleashed a wave of political action that strived but failed to forge a worldwide treaty on climate change in Copenhagen in 2009.
The new document, unveiled in Yokohama in Japan after a five-day meeting, gives the starkest warning yet by the IPCC of extreme consequences from climate change, and delves into greater detail than ever before into the impact at regional level.
It builds on previous IPCC forecasts that global temperatures will rise 0.3-4.8C (0.5-8.6F) this century, on top of roughly 0.7C since the Industrial Revolution.
Seas will rise by 26-82cm (10-32in) by 2100, it is predicted.
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