Climate change is a change of climate that is attributed directly or indirectly to human activity, altering the composition of the global atmosphere. It is the significant and lasting change in the statistical distribution of weather patterns over a period ranging from decades to millions of years. It may be a change in average weather conditions, or in the distribution of weather around the average conditions (i.e., more or fewer extreme weather events.)

Symptoms of climate change in Nepal are:

• Rise in temperature: 0.3 to 0.6 deg c in the last century.
• Melting of glaciers 1-2 mm/year over the last century in higher Himalaya and results flooding of coastal areas, beach erosion, saltwater
• Effect on water resources: change in the pattern of evaporation and precipitation, increase in evaporation and precipitation, more precipitation on the form of rain, increase in runoff
• Effects on storms and desertification: more storms, expansion of deserts and sub-arid areas with higher evaporation
• Forest fire due to environmental warning
• Increment of patient in hospital
• Winter season getting colder and summer season getting hotter as compared to last year
• Ecological effect: effect on agriculture and forest ecosystem