Global warming, melting glaciers and threats to the planet's ecosystems… The long-term effects of climate change are the greatest challenge that mankind has yet had to face. Energy is an essential factor for progress, but it is also the main source of greenhouse gases-putting it into the center of the debate. SUEZ is rising to the challenge by integrating carbon constraints into its industrial processes and increasing the energy efficiency of its facilities. The Group's expertise and experience in the energy sector have allowed it to integrate the climate issue into its business operations without threatening profitability. The development of a diversified generating base has enabled the Group to meet both the challenges of security of supply and of uncontrollable rises in fuel prices. The energy mix includes a large share of alternative energy sources that emit little or no greenhouse gases, such as natural gas, nuclear power and renewable energy technologies.