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Over 4,500 people planted some 20,000 trees in the Portuguese capital. The initiative was Lisbon's first as the European Green Capital 2020.

Germany's greenhouse gas emissions fell sharply last year, putting the country's 2020 climate goal within reach again. A report released by the think tank Agora Energiewende found that emissions fell by 6.5% in 2019 compared with the previous year — equivalent to 50 million tons of carbon dioxide.

A tiny spark in the UK’s hydrogen revolution has been lit – at a university campus near Stoke-on-Trent. Hydrogen fuel is a relatively green alternative to alternatives that produce greenhouse gases.

A group of ship owners have announced plans for a $5bn (£3.8bn) fund to design zero-emissions vessels. They says $2 (£1.50) should be levied on every tonne of ships' fuel - to support research into clean engines.

The world’s first fully electric commercial aircraft has taken its inaugural test flight, taking off from the Canadian city of Vancouver and flying for 15 minutes.

US insurers join retreat from European insurers meaning coal projects cannot be built or operated. Coal is the biggest single contributor to climate change.

The world is beginning to tackle the threat of plastic waste, according to the renowned broadcaster Sir David Attenborough. "I think we're all shifting our behaviour, I really do," Sir David said in an interview with the BBC.

Japan is pursuing a 300 billion ($2.75 billion) yen project to transform disaster-struck Fukushima prefecture into a clean-energy hub, with the development’s first solar farm scheduled to start in January.

For decades, scientists have sought an affordable and effective way of capturing, storing, and releasing solar energy. Researchers in Sweden say they have a solution that would allow the power of the sun’s rays to be used across a range of consumer applications—heating everything from homes to vehicles.

The plastic carrier bag has become something of a symbol for the problems caused by plastic pollution. But according to the family of the man who created it, Sten Gustaf Thulin, his design was supposed to help the planet and he'd be shocked and upset to see what it's become.