hit and injure water-skiers and anglers. Economic As previously mentioned, there are economic benefits, worth millions of dollars, to the trade of exotic species. Another economic benefit that results in invasions of exotic species is the desire to boost fisheries. Asian carp was deliberately introduced to U.S. waters by the American aquaculture industry as a source of food for fisheries and to eat algae in waste waters. The Chinese mitten crab was also suspected of arriving to the San Francisco Bay in the hopes of starting a population for hunting and trading purposes. In Alaska, residents are known to have captured oysters in the lower 48 states and brought them back to grow and harvest them. Bringing a non-native species to one's environment carries the risk of uncontrollable, large-scale problems if that species turns out to be invasive. Political Until NISA went into effect, federal, state, and local regulations of invasive species were not strong and were not strictly enforced. Due to the sprawling and interconnected nature of the issue, too, sometimes policies become cross-purposed. For example, the Fish and Wildlife Service is tasked with preventing the spread of aquatic nuisance species, but also must promote recreational hunting, fishing, and aquaculture, which can all be sources of invasives. Balancing the diverse needs of the American public can be problematic, and sometimes the needs of humans outweigh the need to protect the environment. Additionally, other challenges lie in coordinating international and local regulations and controls. Globalization has allowed people to travel farther and quicker, but differences in cultures and laws are difficult to navigate and they comprise a mismatched patchwork of rules. Controlling the spread and threat of invasive species is similar to the fight against climate change. In both cases, the problems, causes, and effects are global, and therefore require global support for solutions. Unfortunately, unified agreement to combat these issues is extremely elusive. In the latest of large-scale climate change negotiations among nations, the Copenhagen Conference of December 2009 failed to resolve fundamental issues in global climate policy. The gathering of nations could not agree on policy target numbers, ideology, timelines, and other points, and the conference was considered to be a failure caused mainly by national and international politics. Similarly, there has been little international agreement about how to regulate ballast water practices, which can spread non-native species all over the world. Uniform standards would require all in