This chart shows the calories of fossil fuel used to make 1 calorie of protein for various feeds:

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With less than a week to go, participation in Earth Hour has grown dramatically as nearly 200 cities, including 35 in the U.S., join millions of individuals and businesses around the world in turning off their lights on Saturday, March 29th from 8 – 9 pm local time in a dramatic symbolic gesture in support for action on climate change.
Guests at the Inn of Chicago on the city's Magnificent Mile will walk into a darkened, candle-lit lobby. And when they look out at the iconic skyline, it will look different: the Sears Tower, the Hancock Building, the Ferris wheel on Navy Pier, and some 200 downtown buildings plan to turn out the lights at 8 p.m.
It's all part of "Earth Hour," an international climate-change awareness campaign that started last year in Sydney, Australia and that the World Wildlife Fund (WWF) is taking global this year. Starting in New Zealand, and rolling out through dozens of cities, including Bangkok, Thailand; Dublin, Ireland; and Tel Aviv; the campaign is urging individuals, businesses, and landmarks to go dark between 8 p.m. and 9 p.m.

Traditionally people have given up things for Lent. Last year in the Diocese of Liverpool many parishes took part in a Carbon Fast. Through it we were able to focus on God’s Earth and its poorest people in whom, Jesus said, we were to find him.
This year, in Lent 2008, we invite as many as can to join us in a Carbon Fast.
Ash Wednesday: Remove one light bulb (without inviting danger).
Thursday: Check your house for draughts with a ribbon or feather. If it flutters, buy a draught excluder.
Friday: Whatever mode of transport you usually use, try to make at least one of your journeys more environmentally friendly.
Saturday: Consider whether or not you’re using all available avenues for recycling (don’t forget that charity shops play a valuable role).
Week 2
Sunday: Find the most environmentally friendly way you can to get to church today (e.g. walk, bike, car share).
Monday: Turn your central heating thermostat down by one degree. If you have separate thermostats on radiators, adjust them to suit the use of the room.
Tuesday: Check that all electrical equipment is switched off rather than on standby when not in use. Screen savers do not save electricity.
Wednesday: As chocolate is still on the menu this Lent, be sure to reward yourself with Fair trade chocolate.
Thursday: Ensure your mobile phone charger is unplugged when not in use.
Friday: Plan your menu for next week and buy only enough food to avoid waste.
Saturday: When shopping, employ the LOAF principle – that is buy Locally produced, Organic, Animal friendly, and Fairly traded goods.