Black is the most effective colour for trapping the sun's heat, while white is the best at repelling it. Black pavement accounts for 40% of urban surfaces while roofs -- typically covered with black or dark shingles --account for 20% to 25%. For the full column see http://bit.ly/5MqZXt … [Read more...] about White roofs will save more than $1 Trillion globally!
My latest column in the National Post this past Friday (July 3) focused on the billions of kilowatt hours than can be saved by improving the efficiency of escalators -- with litlle or no investement. Read the column at http://bit.ly/5Be86o … [Read more...] about Billions of kWhrs can be saved with motor efficiency on escalators