To the editor: I would like to complement the “opinions” of apparently randomly selected people about global warming. Some of them know very little about this problem and I would like to elucidate some of it: The increase of global temperature in the last about 100 years is close to 1 degree Fahrenheit, which is within normal variation of earth temperature. The press is overwhelmed by statements of environmental prophets like Mr. Gore stressing the danger of global warming. There is really no danger. Rise of water level is minimal 1 mm (millimeter!) per year and this is caused by slightly bigger volume of one-degree warmer water, which expands like everything else with temperature. Melting of floating ice in the Arctic is irrelevant because ice has bigger volume than the water making ice as everybody whose pipes freeze knows. Therefore, melted iceberg contributes nothing to sea water level. The only potential danger of higher water level is melting of ice located on the ground, namely in Greenland and Antarctic. This ice is melting of course, but additional ice is added on the top of the icebergs and the thickness of the ice sheet remains the same. Environmentalists who frighten people about warming usually give the public only selected facts: what does not fit to their theory is not reported. First it is, of course, right to attack pollution by switching to non-polluting energy like nuclear power but this is not related to warming because warming is unrelated to human activity and is probably caused by variations in the activity of the sun. On top of that, North America cannot definitely be blamed for production of too much of carbon dioxide because North America is in carbon dioxide equilibrium since it has more vegetation than any time before. (The trees use carbon dioxide to build their bodies). Z. Hruza, M.D. Hewitt