Green news roundup: lab-grown meat, Arabian 'unicorns' and every European beach rated

Climate change • Artificial meat could slice emissions, say scientists • Price of solar panels to drop to $1 by 2013, report forecasts • The 1847 lecture that predicted human-induced climate change • Tory MEPs defy David Cameron over greenhouse gas targets Conservation and wildlife • Arabian 'unicorn' no longer extinct • 'Shocking' state of seas threatens mass extinction, say marine experts • Why cane toads may not deserve their villainous reputation Multimedia • Swimming in Europe: every beach, lake and bathing spot ranked and mapped • Greenpeace chief climbs oil rig to protest against Arctic drilling - video • Desertification in Inner Mongolia, China - in pictures • Galapagos – in pictures Green living • Can a music festival ever be considered 'green'? • Green houses: Lowering your carbon footprint starts at home • Water Water Everywhere – consumer app of the week • What to do if your bike is stolen Best of the web • Pressure exerted by sunbeams harnessed for energy • 'Super' wheat set to boost yields and reduce hunger • Kashmir conflict spares wildlife For more of the best environment comment and news from around the web, visit the Guardian Environment Network . ... And finally Emperor penguin makes epic detour to New Zealand beach