By Steve Graham, Networx Concrete is perhaps the most common
construction material in the world. The US Geological Survey
calculated global cement production at more than two billion
metric tons per year, and a majority of that cement is used in
concrete. Most concrete production is not inherently eco-
friendly. Environmental Building News magazine notes that the
annual US carbon dioxide output from cement production equals
the carbon dioxide emissions from 22 million cars. Some of the
chemical binders and additives used in concrete are also
environmentally hazardous. However, concrete is a great
insulator, and it can be produced in a variety of more
sustainable ways. There are also many construction options that
cut the amount of concrete needed for a project. Here are some
specific ways to make the production and use of concrete more
sustainable and environmentally sound.