From troubled solar firms to Norway's ban on cars, we run down the biggest stories from the past week

Study urges ministers to step up energy efficiency measures to counter slow roll out of renewables

New study to provide government with data on how much renewable power the seas could generate

But uncertainty over state incentives threatens to hinder ambitious project

Innovative Oyster wave energy generator on track for first full deployment this summer

Finance minister backs plan that would see all new fossil fuel-powered cars off roads from 2015

Forestry offsets may have been much maligned in the past, but acording to EcoSecurities Lisa Ashford, they could have an increasingly important role to play in emission reduction

Report finds patchy adoption of sustainable procurement policies across Whitehall

IT, retail and public sector dominate US list of top green power purchasers