``to use economic stimulus urgently needed to launch the green revolution''.``What we need is both stimulus and long term investments that accomplish two objectives simultaneously with one global economic policy response, a policy that addresses our urgent and immediate economic and social needs and that launches a new green global economy. ``In short, we need to make `growing green' our mantra. ``Leaders everywhere, notably in the U.S. and China, are realising that green is not an option, but a necessity for recharging their economies and creating jobs,'' they said.They also urged all governments to adopt coordinated green stimulus elements, including energy efficiency, renewable energy, mass transit, new smart electricity grids and reforestation. ``In much of the developing world, governments do not have the option to borrow or print money to cushion the devastating economic blows.``So, industrialised nations must, therefore, reach beyond their borders and invest immediately in those cost effective programmes that boost the productivity of the poorest. This means increasing overseas development assistance this year. ``It also means strengthening social safety nets. It means investing in agriculture in developing countries by getting seeds, tools, sustainable agricultural practices and credit to small holder farmers so they can produce more food and get it to local and regional markets," they wrote.``As the third plank of the programme, it is essential that a robust climate deal be reached in Copenhagen in December to replace the Kyoto Protocol limiting the greenhouse gas emissions of industrialised nations, which expires in 2012. ``A successful deal in Copenhagen offers the most potent global stimulus package possible. With a new climate framework in hand, business and governments will finally have the carbon price signal businesses have been clamouring for, one that can unleash a wave of innovation andinvestment in clean energy," they said. ``Copenhagen will provide the green light for green growth. This is the basis for a truly sustainable economic recovery that will benefit us and our children for decades to come,'' the UN chief and Gore said.According to them, with so much at stake, governments must be strategic in their choices and must not let the urgent undermine the essential. ''Investing in the green economy is not an optional expense. It is a smart investment for a more equitable, prosperous future,'' Ban and Gore said.