BULLET OF THE DAY FOR CRACKING PRELIMS - 2019

BULLET OF THE DAY FOR CRACKING PRELIMS - 2019

• HOT HOUSE EARTH::

" HOTHOUSE EARTH" means the planet moving into the High temperature pathway from where there would be no return.

   The delicate equilibrium of the biosphere/earth system has to do with processes that amplify or dampen warming.

For instance, melting of Greenland ice increases open waters that absorb more sunlight and then increase warming and cause further melting. This is a positive feedback. With the increase in carbon dioxide (CO2), chemical-weathering increases and removes CO2 from the atmosphere over geological time — an example of a negative feedback.

When positive feedbacks become stronger than the negative ones, the system may change abruptly and get pushed out of equilibrium.

In order to stabilise the earth, we would have to recognise and then carry out deliberate, sustained action to secure earth systems and also adapt to a warmer world.

Incremental changes along with increasing contributions from renewables and improvements in energy efficiencies would not be sufficient. There should instead be major changes in technological innovation, behaviour, values and governance. This is an unprecedented challenge for humanity..

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