A very simple strategy in saving energy, and thus CO2 emissions, is to ‘think small.’  If you are heating or cooling something, ask yourself what is the smallest amount of that substance you can work with.  This can be applied in many, many ways.  It is a matter of rethinking old habits in many cases.  Here are some examples.

• When heating water for tea, instead of heating a kettle or pot full, measure only the amount you will need and heat that.  Of all common substances, water takes the most energy to raise its temperature.  Reducing the amount you heat will save lots of energy over time.
• When cooling something, like space in your home, try to make sure you are cooling the smallest area possible.  Make sure the doors and windows are closed if you have a room air conditioner.  Otherwise you are pouring money and energy on the ground, figuratively and literally.

Or learn to ‘think small’ on a grand scale and read Small is Beautiful, by E.F. Schumacher.