THE HAGUE, Netherlands (AP) — The United Nations’ top court in a landmark advisory opinion Wednesday said countries could be in violation of international law if they fail to take measures to protect the planet from climate change, and nations harmed by its effects could be entitled to reparations.Advocates immediately cheered the International Court of Justice opinion on nations’ obligations to tackle climate change and the consequences they may face if they don’t.“Failure of a state to take appropriate action to protect the climate system ... may constitute an internationally wrongful act,” court President Yuji Iwasawa said during the hearing....