Greece on Sunday battled four major wildfires that have forced hundreds to evacuate, as soaring temperatures there and in Spain raised fears of more blazes. Scientists say human-induced climate change is amplifying extreme weather – including the heatwaves, droughts and floods seen in several parts of the planet in recent weeks – and that these events will become more frequent and more intense. The international community has agreed that climate change poses an existential threat to human systems and the natural world – but there are a myriad ways to take action. Earth’s average temperature ha…