Dan Raven-Ellison has come up with some pretty inventive ways of getting people to see what’s already remarkable about their environment and to see the potential to make it way better.

We’re not just talking about the environment as a place that’s out there somewhere. He’s often talking about where most of us live – the city.

One example of his ability to shift thinking is that he’s managed to have his city, London, designated as a ‘National Park City’.

In this interview he explains the origins of the National Park City and the thinking behind it. Plus some of his other interesting projects - like 'The UK in 100 seconds' - a stunning aerial video showing Dan walking across the United Kingdom's landscape in quick time.

You can find more about the man who calls himself a 'guerilla geographer' via the profile of Dan Raven-Ellison on our website.

Jan Gehl trained as an architect but ended up spending 50 years studying the space between buildings. Or more specifically how people use that space.

His research and ideas have been influential in cities around the world. His work has laid the foundation for major changes in cities around the world - including New York, Melbourne, and Sydney. And is revered in his hometown of Copenhagen.

He says that city planning for a long while has been about managing cars and traffic. And that the planners had forgotten about people and how they're faring.

Gehl's approach, as he says, is to "be sweet to the pedestrian and cyclist." And by doing that you get a city that's more sustainable, safe, lively, attractive, and better for citizen's health.

If you live in a city, you really should listen to this interview. And if you know a traffic engineer in your city, get them to listen too.

Find out more Jan and his work in our profile of Jan Gehl.

And check out our collection of Jan Gehl's best quotes on cities.

Paul Hawken is a luminary of the modern environmental movement.

He’s written a number of groundbreaking books. Particularly on how business can work together with nature. Those books have included ‘The Ecology of Commerce’ and ‘Natural Capitalism’. Now he’s taken on the monumental challenge of climate change - with ‘Drawdown’.

Read more about the man in our profile of Paul Hawken.

Drawdown is an ambitious project that pulled together top researchers and scientists from around the world - to identify and rank the 100 most effective solutions to global warming. Not just to slow it down, but to reverse it.

In this interview, Paul discusses the most important and bold ideas in Drawdown. Ideas that are refreshingly practical.

But Hawken is a deep thinker. Listen out in this podcast for his philosophical take on the climate crisis.

And for more of his ideas check out our collection of the best Paul Hawken quotes.