On 22 April, Heads of State and Government will gather in New York to sign the historic Paris Climate Change Agreement that was secured last year in December. In preparation for the event, UNFCCC has launched a campaign, encouraging everyone across the world to become part of the change that is happening by posting a short video to show support. BRE Associate Director for Cities, Helen Pineo, talks about what the agreement means for her and for the future of cities.