Environmentalists say China’s just-announced updated greenhouse gas-reduction target, while a significant step that signals continued development of renewable energy and steps to mitigate climate change, is still modest and falls short of providing the clear global climate leadership some had hoped for amid the Trump administration’s retreat. “China will, by 2035, reduce economy-wide net greenhouse gas emissions by 7 percent to 10 percent from peak levels, striving to do better,” China’s President Xi Jinping announced during the Sept. 24 Climate...