Global climate is changing as manifested by rising
surface temperature, melting ice and snow, rising sea
level, increasing climate variability. For more than a
century levels of CO2, methane and other green house
gases are increasing, and it is now scientific reality
that the temperature will rise 1.8-4oC and sea level
will rise by 0.18-0.59 m by 2100. It is now
appreciated that ‘Climate change is the biggest global
health threat of the 21st century’.1