UN climate chief says the science is clear: there is no space for new coal

Christiana Figueres says Australia needs a national consensus to achieve maximum effort in fight to avoid dangerous climate change

Fossil fuels are the new tobacco when it comes to health risk

Letters: We call on the Wellcome Trust and Gates Foundation to divest from the fossil fuel industry and show the leadership we, as future health professionals, need to bring about a healthier economy

California drought threatens luxe Beverly Hills lawns and swimming pools

Violations of proposed water restrictions could carry $1,000 fine as city guzzles more than 215 gallons of water per capita every day, among state’s highest rates

Oceans are world’s seventh largest economy worth $24tn, says WWF report

Vast economic worth of world’s oceans includes fishing, tourism and shipping but is declining due to pollution, climate change and overfishing

What the experts say: how to make our cities more sustainable

Catch-up on the highlights from our recent panel discussion on sustainable cities, including why it is a myth that Spaniards don’t cycle

Ask the real experts about ocean acidification, not climate science deniers

Scientists review column on ocean acidification in The Australian newspaper and find it was ‘misleading’, ‘very wrong’ and ‘ill informed’.