30. What would be the best conclusion for the passage? (A) When high temperatures become the norm, controlling carbon emissions becomes an urgent necessity. (B) If global warming continues to worsen, many island nations will be submerged within a few years. (C) With global warming on the rise, improving working conditions has become an urgent issue that must be addressed. (D) The overdevelopment of industry, agriculture, and livestock farming is also one of the causes of global warming. We must address it seriously.