Mike Bloomberg believes that big cities must take the lead in reducing the threat of climate change. That's why in 2007, Mike announced a revolutionary sustainability initiative: PlaNYC 2030.

A wide-ranging, comprehensive initiative, PlaNYC aims to make New York the greenest city. Already, New York City has greened 15% of its taxi fleet, planted more than 315,000 trees across the five boroughs, and adopted the nation’s most ambitious green energy code . Dozens of City buildings have improved their energy efficiency, helping reduce carbon emissions and save the taxpayers money.  Mike also serves as Chair of the C40 Cities Climate Leadership Group, an association of major cities around the world committed to reducing carbon emissions and slowing climate change.

C40 Cities Announces New Clinton Global Initiative Commitment to Help Cities Prepare for Natural Disasters May. 6, 2013 C40 Cities The new framework will create a common approach for cities to assess climate risk and provide a process to help cities prioritize risk before investing in climate actions.

Beyond Coal Campaign Passes Halfway Point in Coal Retirement Goals Mar. 1, 2013 Sierra Club The Beyond Coal campaign is now more than halfway toward meeting its goal of responsibly securing the retirement of a third of the nation's coal-fired power.

On President Obama's Remarks on Climate Change Nov. 14, 2012 NYC.gov President Obama spoke about finding bi-partisan ways to reduce carbon emissions. I look forward to supporting that new effort in any way I can.

A Vote for a President Who Will Lead on Climate Change Nov. 1, 2012 Bloomberg View The devastation that Hurricane Sandy brought to New York City and much of the Northeast - in lost lives, lost homes and lost business - brought the stakes of Tuesday's presidential election into sharp relief.

C40 Cities on Track to Cut Annual Emissions by 250 Million Tons Jun. 19, 2012 NYC.gov Mayor Bloomberg delivered remarks at the Opening Ceremony of the Rio+C40: Megacity Mayors Taking Action on Climate Change Summit.

Rio + C40: Megacity Mayors Taking Action on Climate Change Jun. 19, 2012 C40 Cities Mayors of the world's largest cities convened in Rio to demonstrate progress in greenhouse gas reductions and launch two new initiatives.

Mayor Bloomberg Highlights Progress in Building Greener, Greater NYC Feb. 15, 2012 NYC.gov The challenges of sustainability can’t be overcome by government acting alone, or by the private sector acting alone. That's why NYC is meeting sustainability goals through public-private partnerships.

Two More Coal Burning Plants in Virginia to Close Sep. 2, 2011 Bloomberg Philanthropies Just a few days after the GenOn coal burning plant in Alexandria, VA announced their plan to close in October 2012, two other coal burning plants in Virginia are taking a similar path.

Op-Ed: Why America Has to Get Off Coal Jul. 29, 2011 CNN Ending our reliance on coal will clean our air, improve our health, create jobs, and expand our economy. That's a reality that America has to act on -- town by town, power plant by power plant.

NY Times Editorial: Mr. Bloomberg and the Sierra Club Jul. 25, 2011 The New York Times An editorial from the New York Times commends Mayor Bloomberg's donation of $50 million to the Sierra Club's Beyond Coal campaign.