To be a lasting success, the Paris agreement will need to be rapidly followed by continued international collaboration as well as credible national policies to slash carbon emissions in countries like the UK, argues Nick Molho, executive director of the Aldersgate Group.

A rapidly growing part of the business world knows that moving to an energy efficient and low carbon economy makes economic sense argues Sky's Fiona Ball.

Marks & Spencer's Mike Barry argues policy makers must harness business support for a Paris deal to accelerate low carbon investment.

Bioregional's Sue Riddlestone argues progress at Paris needs to be matched by a national plan to deliver greener buildings.

M&S's sustainability manager Rowland Hill considers the merits and shortcomings of the new EU circular economy package.

There is a compelling business case for the EU to rapidly improve the resource efficiency of its economy. Many businesses are already leading the way but a strong Circular Economy Package from the EU could help them go much further, argues Nick Molho, executive director of the Aldersgate Group.

Rob Lambe of Willmott Dixon Energy Services argues getting an ambitious Paris agreement will be only half the battle.

2015 is a key year for decisions on the environment.