Myths about global warming
COMMON misconceptions about climate change:
- A scientific debate rages over global warming.
Fact: There is no question the Earth has warmed in recent decades. Government and professional climate-science groups say man-made “greenhouse gases” are contributing to the warming – probably causing most of it, according to a US National Academy of Sciences panel and the United Nations-organised Intergovernmental Panel on Climate Change (IPCC). The scientific discussion focuses on how fast and how high temperatures will rise – depending on what is done to counter warming – and on the impact.
- Satellites show global cooling, not warming.
Fact: Satellite readings once seemed to disagree with ground readings about warming. But a longer satellite record and more careful analysis of earlier readings have largely closed that gap.
- A planet warmer by 1.1°C doesn’t sound bad.
Fact: Scientists’ 1.1°C prediction is a minimum and an average encompassing higher extremes in certain regions, seasons and times of day. Much damage would come indirectly from rising seas, drying out of some areas, heavier rains in others and similar disruptions.
- The sun’s variability is the biggest cause of climate change.
Fact: The sun does “flicker,” but the IPCC says solar variability has made only a small contribution to global warming over the past century.
- Recent warming is a natural rebound from the European “Little ice age”.
Fact: The IPCC says the unusually swift and lengthy warming of the 20th century “cannot simply be considered as a recovery from the ‘little ice age’ of the 15th to 19th centuries.”
- Warming is good because it will save us from a new ice age.
Fact: The man-made gases already in the atmosphere are far more than needed to hold off another ice age.
- A melting Artic ice cap won’t raise seas; ice melting in a glass doesn’t raise the water level.
Fact: Oceans are rising because of melt runoff from glaciers, the Greenland ice sheet and other ice on land, not in the sea. The Arctic Ocean’s sea ice is already displacing water and so, like ice cubes in a glass, won’t raise sea levels as it melts.
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