The various restrictions that have been imposed to tackle the COVID-19 crisis have led many of us to reflect on what might be our response to other pressing issues that we face, especially inequalities in our societies and the major ecological issues of climate change, biodiversity collapse and resource depletion. What has the crisis told us about the state of our planet and societies, and are there wider lessons that can be learned from our response? Even before the pandemic, we had begun to talk in public debate in ways that would have been unimaginable ten years ago: about the climate crisis and resilience to ecological disruption, questioning the dogma of growth at all costs. The pandemic has reinforced concerns about globalisation and challenged beliefs about the role of the state and the possibility of printing money in a real emergency, while showing that we could do very well without certain things, such as shopping trips to Dubai or cruise ships. Many of us have learned to v…
Ice floes in the Laptev Sea, Russia.
Olenyok/Shutterstock Arctic sea ice plays a crucial role in the Earth’s energy balance. It is covered for most of the year by snow, which is the brightest natural surface on the planet, reflecting about 80% of the solar radiation that hits it back out to space. Meanwhile, the ocean it floats on is the darkest natural surface on the planet, absorbing 90% of incident solar radiation. For that reason, changes in sea ice cover have a big impact on how much sunlight the planet absorbs, and how fast it warms up.Each year a thin layer of the Arctic Ocean freezes over, forming sea ice. In spring and summer this melts back again, but some of the sea ice survives through the summer and is known as multi-year ice. It’s thicker and more resilient than the sea ice that forms and melts each year, but as the Arctic climate warms – at a rate more than twice that of the rest of the world – this multi-year ice is under threat.In the last 40 years, mu…