A recent paper found that rich nations are catching the vast majority of fish, even in the waters of lower-income countries, but doubts about the study's conclusions remain.
Heightening the dam will increase the size of California's largest reservoir, but it could also create problems for local fish and wildlife populations.
Lionfish are non-native invaders introduced to Florida waters 30 years ago that have since proliferated to pestilent levels and unleashed an ecological crisis that is only getting worse