The correct answer is “leading”.
Western Europe has taken a leading role in solving environmental issues.
Air pollution in Europe is high. But Western Europe has taken a leading role in solving environmental issues. Pollution emissions had diminished considerably in the last decades. European Union leaders had considered air pollution a priority in Europe. European Union leaders want to reduce pollution to have good levels of air quality that do not cause any harm. The European Environment Agency is responsible to implement the regulations to accomplish that goal.
