Finding the money to pay for initiatives to slow down climate change is seen by many as the greatest challenge facing the international community, as it prepares for historic talks in France in December.

It’s hoped that a global deal will be agreed at the COP21 talks in Paris, which will limit temperature rises to below two degrees Celsius.

Achim Steiner is the Executive Director of the UN Environment Programme (UNEP).

He’s positive that an agreement can be reached but says hurdles remain.

He’s been speaking to Cristina Silveiro.

Duration: 4'52"