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As the world is bought to a standstill by the Covid-19 pandemic, Greta has to put her plans on hold.

The pandemic reveals the enormity of the challenge that tackling climate change poses as Greta learns the drop in emissions caused by the 2020 lockdowns is not enough to put the world on track to meet its climate goals. With mass protests off the agenda, Greta investigates what else could help limit the impact of climate change.

She visits a tree plantation to learn how the age of a forest has an impact on whether or not it can take carbon dioxide from the atmosphere. In Switzerland, she encounters a machine that sucks carbon dioxide out of the air, and in Denmark, where it has been estimated around half of the land is used to grow food for livestock, she visits a research farm that is exploring ways to reduce greenhouse gas emissions generated by beef and dairy cows. Greta also looks closer to home and contemplates how everyone can play a part – from our choice of the food we eat to the clothes we wear.

Having recovered from Covid-19, Greta also explores what lessons can be learned from the international response to the pandemic, meeting with German chancellor Angela Merkel to demand more rapid action to challenge climate change before she returns to school at the end of a pivotal year.