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15 votes
2 answers
3k views

How much energy does it take to create a single light bulb?

15 votes
4 answers
25k views

Is leaving the fridge door open for, say, 10 seconds a "big deal"?

27 votes
6 answers
1k views

What form of electrical lighting has the smallest energy-footprint?

3 votes
1 answer
355 views

How much energy would it save to park cars in the shade in summer?

3 votes
2 answers
2k views

What is marginal energy?

2 votes
1 answer
79 views

Materials inside solar cells

12 votes
7 answers
5k views

What is the most sustainable way of making coffee?

12 votes
4 answers
392 views

Are there projects that use renewable energy sources to create renewable energy sources?

4 votes
5 answers
25k views

What is the difference between "hydro" and "tidal/wave"? And what is the difference between "solar (heat)" and "solar panels"?

2 votes
2 answers
399 views

Is there a difference between GW and GWe?

33 votes
10 answers
37k views

What to do with old, unused incandescent light bulbs?

1 vote
0 answers
22 views

How much air is required to effectively ventilate while charcoal burning?

2 votes
2 answers
260 views

Powering a small apartment

12 votes
2 answers
5k views

Do switchable sockets left "on" use electricity if there's nothing plugged in?

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