Climate change has become a big threat for Australia’s multi-billion dollar tourism industry as the temperatures and sea levels rise bringing the nation’s top natural wonders in the firing line, a study alerted on Thursday.

Environmental advocacy group, The Climate Council, which has come out with the report, said that the government still needed to put more efforts to reduce carbon emissions which is harming Australia’s beaches, national parks and the Great Barrier Reef.

Australia’s tourism industry is second-largest export industry in the country and is valued at Aus$40 billion (US$31 billion). The industry employs more than 580,000 people, the study said.

Major cities in coastal areas which have popular visitor destinations, are expected to face more frequent flooding in the years to come. Meanwwhile, the study also found that Australia’s “Red Centre” region could experience more than 100 days annually above 35 degrees Celsius by 2030.

” To see Australia’s remarkable natural wonders, tourists travel from across the globe. But these icons are in the climate firing line as extreme weather events worsen and sea levels continue to rise,” Report co-author and ecologist Lesley Hughes said.

Hughes further said that the country’s most popular natural destinations including the beaches could become ‘no-go zones’ during holidays as there is a  potential for extreme temperatures to reach up to 50 degrees in Sydney and Melbourne.

A separate report last year from Deloitte Access Economics valued the Great Barrier Reef as an asset worth Aus$56 billion, which included its tourism revenues and its indirect value for people who have not yet visited but know it exists.