Im pretty sure its A and C but if i had to choose one i would go with A
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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Most farmers opted to use migrant labor instead of full-time employees because the work was seasonal. Hence, Option 3 is the correct statement.
<h3>What do you mean by migrant labor?</h3>
A migrant worker is someone who migrates inside a domestic country or out of doors to pursue work. Migrant employees generally do now no longer have the aim to live completely withinside the country or location wherein they work.
Farming is mostly seasonal as the major work depends on weather patterns.
Therefore, In this context, Most farmers opted to use migrant labor instead of full-time employees because the work was seasonal. Hence, Option 3 is the correct statement.
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In the 1850s they defended slavery in the United States, and promoted its expansion into the West against northern Free Soil opposition.