Renewable energy resources used to be called "alternative" sources of energy, but are quickly becoming mainstream. A source of energy is renewable if it can be replaced in a human lifetime, or as quickly as it is used.
To access the contents of this site, you need to log in or subscribe
Feedback
Which of the following best describes your feedback?
InThinking red alert
Free access weekend, 4-5 February
Sign up for "Basic access" and get "Premium access" to ALL CONTENT completely FREE for two days.
Don't miss out, find out!
Note: if you already have a basic subscription, you will automatically get premium access for the above two days.
Twitter 
Facebook 
LinkedIn