So I went for a lil' walk yesterday... together with hundreds of thousands of people around the world, including Leo and Cara no less.

Why? To ask world leaders to act on climate change at the UN Climate Summit happening in New York this week.

Check out some of the best shots from an awesome day of action and learn more about what's happening this week.

So, why care about climate change?

Changes in the weather are already affecting people's lives with devastating effects. It is people in poor countries who are suffering the effects of climate change the most, even though they have contributed to it the least.

Leaders from each UN Member State will meet at the UNFCCC COP in Paris next year to try an come to an agreement on how to tackle climate change. Before that, UN Secretary-General Ban Ki-moon decided to host a Climate Summit in New York, where country leaders, as well as finance, business, civil society and local leaders from public and private sectors will be discussing actions to significantly reduce emissions. It’s tricky and countries often don’t want to take a lead on reducing emissions or stumping up the money, but that's why we need to keep up the pressure and push harder for long-term solutions.

ActionAid USA campaigners will be there too and they're also running an online action asking Obama to pledge support to a Green Climate fund in the US.

Check out some of the best action from the London People's Climate march

Here's a video from Cara Delevingne's Instagram (I was next to these guys all the way - best moving band ever)

They say 40,000 people took part in the march... it was hard to see the end of it!

You got those with the mad props

Those with the wicked placards

And those with great moves!

Meanwhile in New York...

What's next?

Now it's time to keep up the pressure on politicians in the run up to Paris 2015, and to be clear that words are not enough. Watch this space for more from Bollocks to Poverty on this issue coming very soon.

Where you at the march yesterday?