This week on Earth Beat: Airplane travel is under pressure to green up their act so how come the equally polluting computer industry has escaped the same flak?
Why one woman wants to get people to eat a weed and we meet a weed-eater extraordinaire, one of a select group who can live off the fat of the land

Computers pollute too: Plane travel is responsible for at least 2% of human carbon dioxide emissions but another industry has now reached a similar level, only it's had a lot less stick.
Your computer is also an energy guzzler being fed, indirectly of course, by fossil fuels that produces Co2.
2% may not sound like a lot but if airplanes are being forced to change their ways what’s being done to green computers.
Dr Alexander Wissner-Gros, an expert on the environmental impact of computing at Harvard University explains how much energy we generate when we surf the net.
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Creating green IT: Many in the IT industry believe computing can be a tool to tackle our carbon dioxide emissions. Cisco is the largest maker of networking equipment in the world but many of it's employees have reduced their travel schedule because of a system they've devised know as TelePresence.
Bart Sweerman is a senior director with Cisco and told how IT is helping them keep their own footprint in check.
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More than a weed: Some biologists can get really excited about different types of plants. But for Mary Abukutsa it's weeds that get her excited. The spider plant used to be a standard green in parts of Africa. Over time it fell out of favour until Mary did some research and revived it’s withered reputation.
Now it’s on the menu in some of Nairobi’s more interesting restaurants and that’s where we sent our reporter Michael Kaloki.
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Foraging for supper: Another man is also launching a personal campaign to put weeds back on people’s dinner tables, not by cultivating them, but by foraging. Deane Jordan lives in Orlando, a very fertile part of the state of Florida.
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On next week's Earth Beat: The 4 day work week has been winning fans in the US state of Utah. It seems to be breeding happiness while saving energy at the same time so are we hearing the death knell of the 9-5? Also on the programme we find out the secret ingredient to making cows more environmentally friendly. Join us for this and more on next week's programme.