The Earth’s climate is changing and there is concern about the potentially adverse effects of these changes on life on the planet. What is your position on the following measures that have been proposed to address global climate change—a cap-and-trade system, a carbon tax, increased fuel-economy standards, and research? Are there other policies you would support?
Robert McLeod
The Earth’s climate is always changing. Biological influences have always been a part of this change along with inanimate fluctuations. Plant and animal respiration has changed the composition of the atmosphere many times.
The current geologic epoch has been named the Holocene Epoch of the Quaternary Period, but it may simply be the most recent interglacial of the Pleistocene Epoch. Some studies indicate that at the height of the last interglacial temperatures ran 3°-5°C warmer than they are now. In the past two thousand years we have witnessed vineyards in Britain and northern Europe, agriculture in Greenland, the cold spell of the late first millennium, C.E., i.e., the “Dark Ages,” the “mini-ice age” of the mid-second millennium, C.E., and the extremely cold decades of the mid-twentieth century.
Our genus, Homo, originated in the early Pleistocene and has existed for over two million years. Our species has been around somewhat over 100,000 years. There have been many changes in the climate during that span. Glaciers advanced and retreated, savanna replaced forest and desert replaced savanna. Sunspots flared and ebbed, the planetary axis shifted, and the planet’s orbit varied minimally. Human activity was an insignificant synchronism.
There is no question that we must contain and reduce man-made pollution. See discussion of energy below. The long climactic history of the planet indicates that the fervent activity of its dominant and most numerous primates may be a minor factor in climate change, which could be accelerating a warming phase in conjunction with other primary causes.