Seventy-five per cent of all extreme heat waves felt around the world are attributable to climate change, showed a new report. Researchers said these environmental changes are not just related to hot days, but are triggering nearly one in five storms responsible for extreme precipitation.

A climate report from Unites Nations in 2014 claimed that human activities are highly likely to be responsible for the most global warming witnessed in the past 65 years. There are only 5% chances for the global warming during the same period to have occurred because of natural processes.

“Already today 75 percent of the moderate hot extremes and about 18 percent of the moderate precipitation extremes occurring worldwide are attributable to warming”, ETH Zurich climatologists, including Erich Fischer and Reto Knutti, wrote in their study.

Changes that were expected to take place once every 1,000 days or roughly every 33 months were considered as moderate extremes in the study. These events have a great potential to give rise to flash floods, lightning strikes and the resulting blackouts that cause demise of thousands of victims annually.

For the study, the researchers held comparisons between data dating back to the start of the 20th century and satellite data recording modern conditions.

Severe storms and heat waves have occurred so often in the last century that they can’t be considered rare anymore. The research has highlighted that global climate change appears to be the biggest driving force behind extreme weather.

The researchers determined through the study that rise in temperatures around the globe have accounted for an average of 1.4 degrees Fahrenheit above preindustrial levels.

A United Nations summit in Paris will bring world leaders to a common platform to discuss policies to mitigate effects of human activities on global environment.