Explorers agreed:"If the condition of global warming keeps getting worse, eventually, the ice in Arctic will melt gradually each year during summer up to the stage where ship can smoothly sail through the area in ten years time (around the year of 2020), "
A batch of explorers says that if the condition that the global weather warms keeps on bottom to go, perhaps within 10 years, namely about in 2020, at present the ice sealed of the arctic ocean will become the ocean that can make the boats and ships without obstructionly sailed in summer in every year.