Population growth tends to get blamed on other people: Africans and Asians who have "more kids than they can feed," immigrants in our own country with their "large families," even single mothers in the "inner city."

Demographers aren't known for their sense of humor, but the ones who work for the United Nations recently announced that the world's human population will hit 7 billion on Halloween this year. Since censuses and other surveys can scarcely justify such a precise calculation, it's tempting to imagine that the UN Population Division, the data shop that pinpointed the Day of 7 Billion, is hinting that we should all be afraid, be very afraid.

The water-energy nexus is a critical aspect of sustainability that must be understood. Energy production requires water, and when energy is saved, so is water. A 2006 report released by the U.S. Department of Energy stated that 39 percent of total freshwater withdrawals in the U.S. were for energy production. This is second only to withdrawals used for agricultural irrigation, but it can be argued that energy is used in order to pump the water required to irrigate. However, for the purpose of this blog, the two categories will remain separate.

Even with the heavy requirements for water and energy, there are many ways that the water-energy nexus can be used in a way that reduces and minimizes environmental impacts. Efficiency and conservation can be practiced and are the two most affordable and immediate ways that everyone can use less energy, thus saving water. Also, renewable energy such as wind and rooftop solar can be implemented in many areas, and these two types of energy production do not require any water. They also reduce impacts by lowering demand for fossil fuel power plants, and this means less water is pulled from rivers and lakes that power plants rely on to produce electricity. This point is critical everywhere, but in regions like the Rocky Mountain West where water is scarce and population is growing rapidly, it becomes even more important. Reducing demand on power plants also means that there are fewer toxic chemicals and other harmful pollutants entering our water and air. 

Demographers aren't known for their sense of humor, but the ones who work for the United Nations recently announced that the world's human population will hit 7 billion on Halloween this year. Since censuses and other surveys can scarcely justify such a precise calculation, it's tempting to imagine that the UN Population Division, the data shop that pinpointed the Day of 7 Billion, is hinting that we should all be afraid, be very afraid.

A green myth is on the march.  It wants to blame the world’s over-breeding poor people for the planet’s peril.  It stinks.  And on World Population Day, I encourage fellow environmentalists not to be seduced.

The actor Jeremy Irons has announced that he plans to make an Al-Gore style movie about the population problem.  The screen idol with a social conscience — who famously has seven homes and a pink castle in Ireland – says his inconvenient truth is that “there are just too many of us”.