Scientists and international reports have revealed that cases of devastating wildfires are increasing as a direct result of global warming. Southern California has witnessed fierce wildfires and the situation is only set to become worse in future, said the scientists.

At least three different studies and reports have raised concern over wildfires in past three months. Scientists have been reluctant to associate specific fire to global warming, but they have been warning for years that more fires and earlier fire season will become more common in future.

"The fires in California and here in Arizona are a clear example of what happens as the Earth warms, particularly as the West warms, and the warming caused by humans is making fire season longer and longer with each decade", said University of Arizona geoscientist Jonathan Overpeck.

The affected area has only increased by about 87,700 acres a year in last 30 years, according to an April study in the journal Geophysical Research Letters.

The areas where wildfires are increasing are the ones where drought has been worsening. It is clear indication that climate change is playing a major role in triggering bushfires, said study main author Philip Dennison of the University of Utah.

According to federal records, the last decade has top five years that have burned the most acres. About 6.4 million acres a year burned on average between 2010 and 2013 compared to 0.9 million acres a year during 1980s.

The 841-page National Climate Assessment, released by the federal government earlier this month, mentioned increase in wildfires as a result of climate change as one of a dozen key messages in the 841-page National Climate Assessment. Wildfires were mentioned 200 times in the report and claimed to only increase in future with the rise in intensity of global warming.