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Forty years ago this month, Friends of the Earth and Greenpeace were founded - born from the nuclear opposition movement, they would eventually become two of the world's best known environmental organisations.

Along with WWF, which is celebrating it's 50th birthday in 2011, FoE and Greenpeace have led the global green movement.

But what have they achieved?

Have the donations and the talk really changed our relationship with Planet Earth?

This week on One Planet we invited the heads of all three organisations to join us in a debate about past successes, failures and the future of green politics.

We hear from the head of Greenpeace that we're "losing the planet", while WWF concedes that money is at the root of it all and that even by combining the revenue of all three organisations they would barely be able to solve the problems of one country, let alone the whole planet.

We also find out whether they think climate change is really the most important issue to tackle.

As ever, tune in and then get in touch to let us know your views.

You can email the team at oneplanet@bbc.com, or join us on Facebook, the link is below.'