A roughly linear global temperature increase of about 0.5°C per 100 years seems to have occurred from about 1800, or even much earlier, to the present. This value may be compared with what the International Panel on Climate Change (IPCC) scientists consider to be the manmade greenhouse effect of 0.6°C per 100 years. This long-lasting linear warming trend is likely to be a natural change.
Hardly a stump speech goes by without a political candidate calling for “more renewable sources of energy such as wind or solar” to either stop our dependence on foreign oil or to slow the CO2 emissions that mean certain doom for our planet. The politicians are doing what most politicians do: spewing rhetoric that they know voters want to hear; proposing programs they know little or nothing about.
An Inconvenient Truth, Al Gore's documentary on the threat posed by global warming, took home two Oscars at the recently held 79th annual Academy Awards. The Academy awarded the filmmakers with the Oscar for best documentary and gave another to singer and songwriter Melissa Etheridge for the song "I Need to Wake Up" that was used in the film.