True, environmental challenges have changed significantly since the 1970s.
<h3>What are the changes made to address the environmental issues?</h3>
Environmental issues have become increasingly important in international affairs since 1970.
The initial treaties were the result of regional and national initiatives from a limited number of countries.
However, the topic gained global significance in June 1992, when the United Nations Convention on Climate Change was signed during the Rio de Janeiro Earth Summit.
The Kyoto Protocol, which was signed in Japan in December 1997, extended this accord even further.
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