Can I recycle window envelopes (and other dumb eco-questions) (New Scientist)

Generating electricity through exercise

You can exercise at home and generate electricity with the Pedal-A-Watt. This device allows a cyclist to generate up to 200 watts of electricity. An hour's worth of cycling could power a low energy light bulb for eight hours.

Micro-windmill efficiency

The UK building research establishment compared the payback times of micro wind turbines in different locations. It found that inshore urban locations struggled to repay their cost where as coastal locations paid for themselves in under a year. One site at wick generated 3000 lilowaat hours a year, about 40% of that household's needs.

Reference: 15 November 2008. Can I recycle window envelopes (and other dumb eco-questions)". New Scientist, 200 (2682), pp36-42