The world needs $1.9 trillion in green technology investments a year, with over half of that sum necessary for developing countries," the UN said Tuesday.
"Over the next 40 years, $1.9 trillion (1.31 trillion euros) per year will be needed for incremental investments in green technologies," the UN Economic and Social Affairs body said in its annual survey.
"At least one-half, or $1.1 trillion per year, of the required investments will need to be made in developing countries to meet their rapidly increasing food and energy demands through the application of green technologies," it added.
At the moment, "external financing currently available for green technology investments in developing countries is far from sufficient to meet the challenge," it assessed.
Over the last two years, climate change funds managed by World Bank disbursed about $20 billion, a fraction of the sum necessary for developing countries to build up clean energy technologies, sustainable farming techniques and technologies that help cut non-biodegradable waste production.