This Earth Hour, here are some things to think about relating to climate change while the lights are off, from women and teens including an activist, an author and a scientist.

Earth Hour 2019: switch off the lights and save the planet

Sarah Crossan, author and Ireland’s Children’s Laureate

The real action has to be taken by governments and people in power

Climate change and its terrifying consequences are not inevitable

When governments and industry have so far failed to act with enough urgency, we all have no choice but to step up and lead by example

Professor Joanna Haigh, co-director of the Grantham Institute

Climate change is an existential threat, certainly to various species, and eventually it’ll be an existential threat to humanity

There’s so many ways in which acting on climate change can help on health, poverty and energy security

Becky Spencer, head of public affairs campaigns

Earth Hour is on Saturday 30 March from 8.30-9.30pm. But what should we be thinking about?

Earth Hour 2019: why switching off your lights for an hour could save the planet