The latest stories from the Science & Environment section of the BBC News web site.
Contador given two-year drug ban
Alberto Contador is handed a two-year ban for a doping offence - and is stripped of his 2010 Tour de France title.
Mars cooperation near collapse
US space agency officials let their European counterparts know that it is now highly unlikely that America will participate in joint missions to the Red Planet in 2016 and 2018.
Clan chief joins conservation row
A clan chief is accusing the Scottish government and SNH of not listening to islanders' concerns about a conservation area.
Transplant jaw made by 3D printer
An 83-year-old woman is fitted with a jaw made by a 3D printer in what doctors say is the first operation of its kind.
Race to drill into Antarctic lake
Russian scientists are attempting to beat US and British rivals to be first to drill into an Antarctic sub-glacial lake.
China in EU carbon scheme 'ban'
China tells its airlines not to pay charges to the EU's Emissions Trading Scheme, aimed at cutting carbon emissions.
'Birth defect risk' for diabetics
The risk of birth defects increases four-fold if the pregnant mother has diabetes, a study of 400,000 pregnancies in England suggests.
PM urged to cut wind farm subsidy
More than 100 Conservatives are among MPs who have written to the prime minister calling on him to slash subsidies for onshore wind turbines.
VIDEO: Birds' paradise lost in Kashmir?
Nearly a million migratory birds visit Kashmir's wetlands every year, but this time the severe winter has made it nearly impossible for them to find food.
Anti-fracking demo in Enniskillen
About 100 people gather in Enniskillen to demonstrate against the use of fracking to extract gas from shale rock in County Fermanagh.
Oil spurs Canadian PM China visit
Canadian Prime Minister Stephen Harper will visit China next week to discuss Canada's oil products, after the US blocked a key pipeline.
Prince optimistic for fisheries
Prince Charles says there are reasons to be optimistic about the state of the world's oceans, but it is "critically urgent" to tackle overfishing.