Five years ago, there was a fear that man-made changes in the atmosphere could lead to as much as an 8 degrees Fahrenheit increase in the average global temperature in the next 60 years. The other scenarios were so scary. Sea levels would still rise, some glaciers would melt and ecosystems would be disturbed, he pointed out. James Titus is the author of the EPA climate study released last week. The data is getting better, the estimates are becoming more precise.
Some dissenters remain.
They say the data is 'broadly consistent' with global warming. The greenhouse effect is a natural phenomenon. This effect raises the planet's natural average temperature from zero to about 60 degrees Fahrenheit. Without the effect, life would be impossible. This increase is directly linked to the burning of fossil fuels , the felling of forests and other human economic activities .