"'The catalytic converter has had a profound impact on our environment,' says Jim Kliesch, senior engineer for the Union of Concerned Scientists. Advances in the catalytic converter, which rolled out on GM's 1975 model-year cars, and computer-controlled fuel injection technology have all but eliminated tailpipe emissions, he says."
Reef Madness: The Next Big Green Litigation Campaign? /
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"What evidence is there that GHG emissions cause or contribute to coral bleaching? According to the comprehensive Status of Coral Reefs of the World: 2004, ... 'The coral bleaching in 1998 was a 1 in a 1,000-year event in many regions with no past history of such damage in official government records or in the memories of traditional cultures of the affected coral reef countries.' Approximately 16 percent of the world’s reefs were seriously damaged. ... According to the IPCC’s Third Assessment Report ..., the 1990s were 'very likely' the 'warmest decade' and 1998 the 'warmest year' of the past 1,000 years. ... In addition, the IPCC concludes that, 'most of the warming observed over the last 50 years is attributable to human activities'.... Thus, it would seem, the bleaching events of 1998 were likely due to mankind’s enhancement of the greenhouse effect.
In fact, however, the asserted linkage between anthropogenic warming and coral bleaching is problematic. To begin with, there is considerable evidence that the 1990s were not the warmest decade of the past millennium. A wealth of proxy data confirm the reality of a world-wide Medieval Warm Period (circa A.D. 800-1300), when average temperatures in North America, Europe, Asia, Africa, and South America were as warm as or warmer than they are today. ... When scientists compare apples to apples, using proxy data to track 20th century temperatures, the mid-1930s and early 1940s appear to be warmer than the 1990s. ... Yet there is no evidence of mass bleaching/mortality events in the 1930s and 1940s."
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