California’s healthcare industry can lead the way on stronger climate change regulation

Last week, dozens of businesses wrote letters to California lawmakers to urge passage of bills that would regulate emissions. Susan Vickers of Dignity Health explains why her company was one of them

Say goodbye to capitalism: welcome to the Republic of Wellbeing

If governments and companies are serious about meeting the Sustainable Development Goals then they’ll need to ditch their bad habits

Is the US ready to stomach eating bugs?

Bugs are a greener alternative source of protein, but US consumers are still grossed out by eating crickets. Will companies be able to make insect farming viable?

Kale crisis: aphids could destroy the superfood-smoothie revolution

Gwyenth Paltrow fans take note: your favourite fashionable curly green vegetable is suffering the ravages of an insect invasion

Introducing ‘treeconomics’: how street trees can save our cities

As a fight over 11 lime trees in Sheffield escalates, activists in cities all over the world are making the case for urban trees – to cut pollution, increase land value and even make you feel younger

Green city: share your photos and stories of urban trees

From local identity to improving health, trees can play an important role in cities. Share your pictures and tales of favourite urban trees with GuardianWitness

We’re exposed to hormone-disrupting BPA just by breathing

Manufacturing and wastewater treatment sites are releasing bisphenol A into the air, exposing people to high levels of the chemical, according to a study

Is your deodorant safe? – interactive

Of all the products in your bathroom cabinet, deodorant is among those linked to the most health concerns. Use our interactive to research yours

Eight ways business and government could make healthy eating easier

The obesity epidemic underlines the need for healthy diets, but achieving this is not straightforward. Here we round up how experts think it could be done

Extend UK national park model across London, say campaigners

Founder of National Park City initiative, Daniel Raven-Ellison, says idea would make the city greener, get children connected to nature, and tackle obesity