A new report on global warming (1) ____ the frozen Arctic Ocean will soon be like a normal sea in the summers. There are (2) ____ changes happening in the polar environment and its fragile ecosystems. For millions of years, the sea around the North Pole has been frozen all year round. Recent research from the World Wildlife Fund (WWF) and the Catlin Atlantic Survey show things are changing fast. They predict that within a decade, the Arctic will be (3) ____ ice-free in the summer. They base their prediction on the rate at which the sea ice is currently thinning. An ice-free Arctic will have consequences for the whole world’s weather patterns. The Arctic sea ice is a key part of the Earth’s climate system. Experts call it Earth's “refrigerator”. They said that as it disappears, the world will become a lot warmer. Scientists are still unclear exactly what changes there will (4) ____ to our weather. Forecasters predict an increase in all kinds of disasters and extreme weather events. These new findings provide an urgent call for world leaders to act. The timing of the WWF report is a reminder to those attending the UN climate summit in Copenhagen in December. Rich countries will (05) ____ some tremendous pressure to finally agree to reduce their carbon emissions by 40 per cent by 2020.