Scientific Evidence of Climate Change

Scientific Evidence of Climate Change

Kevin Trenberth

Former Coordinating Lead Author of the IPCC

In this video, Kevin explains how global warming has been observed and measured from a scientific perspective. He looks at rising global temperatures caused by rising CO2 levels and how Earth’s energy imbalance has risen over time, and also outlines the consequences of the EEI always being a positive number. He then explains how global warming has been observed through rising ocean temperatures and sea levels. Finally, he finishes by talking about how global warming has been observed through changes in the land and ice around the world.

In this video, Kevin explains how global warming has been observed and measured from a scientific perspective. He looks at rising global temperatures caused by rising CO2 levels and how Earth’s energy imbalance has risen over time, and also outlines the consequences of the EEI always being a positive number. He then explains how global warming has been observed through rising ocean temperatures and sea levels. Finally, he finishes by talking about how global warming has been observed through changes in the land and ice around the world.

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Scientific Evidence of Climate Change

21 mins 53 secs

Overview

The observational evidence proving global warming is mounting and extremely visible. Every year seems to be record-breaking, with the ocean found to be at its warmest state ever. Land and sea ice is melting, and heatwaves and wildfires are a consequence on land. Ironically, both droughts and heavy rains, with their associated flooding risk, are increasing too. Carbon dioxide levels are at all time highs, the energy imbalance is rising, seas are warming and rising, and there has been significant changes in the land and ice.

Key learning objectives:

  • Outline how global temperatures, Earth’s energy imbalance and CO2 levels have risen

  • Outline how global warming has been observed through changing oceans, land and ice

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Summary
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Expert
Kevin Trenberth

Kevin Trenberth

Dr. Kevin Trenberth is a Distinguished Scholar at the National Center for Atmospheric Research (NCAR). He was a Coordinating Lead Author of the 1995, 2001, and 2007 Scientific Assessment Reports of the Intergovernmental Panel on Climate Change (IPCC). Kevin also shared the 2007 Nobel Peace Prize which went to the IPCC and Al Gore. Between 1999 to 2006, Kevin served on the Joint Scientific committee of the World Climate Research Programme (WCRP). Kevin then went on to chair the WCRP Observation and Assimilation Panel from 2004 to 2010 and the Global Energy and Water Exchanges (GEWEX) Scientific Steering Group from 2010 to 2013. He has also served on many US national committees and is a Fellow of the American Meteorological Society (AMS), the American Association for the Advancement of Science (AAAS), the American Geophysical Union (AGU), and an honorary fellow of the Royal Society of New Zealand Te Apārangi. Kevin has received many awards throughout his career. In 2000, he received the Jule G. Charney award from the AMS; in 2003, he was given the NCAR Distinguished Achievement Award. In 2013 he was awarded the Prince Sultan Bin Abdulaziz International Prize for Water, and he received the Climate Communication Prize from AGU and in 2017 he was honoured with the Roger Revelle medal by the AGU.

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