Climate change is the defining issue of our time. And just as it is accelerating, so too must we summon up a greater sense of urgency. The good news is that we still have time to address the challenge, if we move now – and move together. The co-founder of sustainable development charity Forum for the Future explores the positives of new technology, innovation, activism of young people – and the growing sense of solidarity between generations as young and older grasp their obligation to secure a safer world.

Jonathon Porritt was Director of Friends of the Earth 1984–90, co-chair of the Green Party 1980-83 and from 2000-2009 was Chair of the UK Sustainable Development Commission.

Hannah Martin is the Co-Executive Director of Green New Deal UK.