Thousands of people are marching through the streets of Glasgow demanding action from world leaders in the fight against climate change.
Between 50,000 and 100,000 people are estimated to join in the protests with crowds descending on Glasgow Green at around 3pm.
Here is a selection of images from the protests so far.
1. Sauchiehall Street
Protesters marching down Sauchiehall Street in Glasgow on Saturday afternoon. Photo: JPIMedia
2. Humanity is failing
An activist with a sign which reads: "Humanity is failing." Photo: JPIMedia
3. Crowds marching
Thousands of people joined the crowds marching through the city centre on Saturday. Photo: JPIMedia
4. Only mushrooms will survive
An activist with a mushroom top on their head and a sign which reads: "With your blah blah blah only mushrooms will survive." Photo: JPIMedia