The increasing presence of carbon dioxide in the atmosphere has been contributing to the rise in temperatures all over the world. Scientists have cautioned people against the perils of global warming.

Reports of climate change have been coming in from various parts of the world. It is feared that drought will extend to more areas in Asia and Africa. Melting of ice in the Arctic Ocean and the rise in sea level could be other disastrous effects of global warming.

The process of restricting the release of carbon dioxide into the atmosphere has gained more relevance in recent times. The emission norms have been made more and more stringent in developed and developing countries. Advanced countries are devising newer methods to limit the output of polluting gases that damage the environment.

One of the western countries is planning to record personal carbon allocation by means of a swipe card. Accordingly, points will be allocated each time one buys petrol or tickets for air travel. The annual carbon allowance is stored as points on an electronic card. People who do not use their allocation can sell the surplus to banks. On the other hand those who exceed the points allocated to them will have to pay more for their journey.

New technologies have been employed at various levels in a bid to reduce the carbon content in the gases emitted by automobiles. One of the recent developments reported from Karnataka is the use of blended diesel in the State transport buses. Though blending petrol with ethanol has been in practice, similar blending with diesel was reportedly not easy.

The Clean Development Mechanism, an arrangement under the Kyoto Protocol, helps reduce the generation of polluting gases. Under this, industrialised countries can take up projects that result in greenhouse gas reduction in developing countries.