In the northwestern waters of the Pacific Ocean, the United States spent nearly 20 years refurbishing dams, restoring damaged river basins, and refurbishing rivers, all in order to protect the survival and reproduction of salmon. At present, the United States has invested billions of dollars in the protection of salmon. In 2004 alone, it invested $350 million. To date, no other endangered species has been so preciously protected as salmon.

But rising temperatures, as a new threat, are more deadly than gillnets (fishing methods), forcing the salmon to die. This threat is even more deadly than hydro-powered turbines. Hydro-electric turbines have continued to kill millions of migratory juvenile salmon. In fact, people question whether salmon can survive in the Pacific Northwest.

Climate change has caused the rivers to heat up, and the spring floods broke out in advance, disrupting the life cycle of the main fish in the local area. Regardless of how humans take measures to reduce greenhouse gas emissions, more than half of river temperatures in low latitudes in 2040 will exceed 70 degrees Fahrenheit. This temperature is too high for salmon.

“The only thing that can overcome this difficulty in this century is the large number of salmon that live in high latitudes, because there will still be snow and the water temperature will remain low.” Former Director of Oregon Fisheries Department Jim Martin said. But if in the next 50 years, the world is not committed to reducing carbon dioxide emissions, even if the salmon is transferred to a northern region like Alaska, it still can not eliminate the threat of its survival. This means that hydroelectric dams that supply more than half of the electricity in the area are more valuable than ever, because hydropower does not emit carbon dioxide.

This fact has morally impacted environmentalists. Over the years, Indian tribes have worked hard with commercial fishermen and recreational fishermen to reduce the impact of dams on fish. But now, the dam is not only a regional economic force, but at the same time, at least in the short term, it is an important means to reverse the current environmental dilemma.

Another dilemma for environmentalists is to slowly realize that they have to compromise every single part of the “saving the environment” that has been advocated for decades, to the single need to stop or reverse climate change that needs to be resolved. Pat Ford, executive director of the Save Our Salmon Association, believes that environmentalists can't simply stop what they think is harmful but provide solutions. He said: "If you don't do it in both ways, then blind assistance."

And Steve Wright said: "We are not in an era of confrontation between economic development and environmental issues. Now more is the confrontation between environmental and environmental issues."

Scientists have recognized that climate change requires the real bottleneck that people are focused on. Even in the best scenario, before humans actually reverse the trend of climate change, the greatest impact of climate change will change the living conditions of all living things, including humans, over a period of time.

This also represents a painful choice to make excellent priorities. Environmentalists around the world now face this choice.

Ford said: "I think that responding to global warming needs environmentalism to take a completely new approach."

We can imagine the future world scene. Although humans are constantly working to stop global warming, the temperature continues to rise and many rivers where fish are gathered will not be suitable for the survival of salmon. In fact, the species that we spend a lot of money to protect now will be extinct by then.

Experts claim that “many fish stocks that spawn during the summer, regardless of the migration or development of their juveniles, will be adversely affected by climate change. From southern British Columbia to California, the southern fish population has been greatly affected. Impact.” The salmon that live in the northwestern seas will meet with a completely different survival barrier in the future.

Some scientists believe that the salmon that live in the Far East of Russia to investigate the Canadian peninsula, the Gulf of Bristol, and the northwestern waters of Alaska are the healthiest, genetically most suitable, and the salmon of these waters are better. Respond to climate change and multiply. Therefore, people concerned believe that protecting these backbones will be the most cost-effective way to protect the salmon.

But so far, Ford and other fish protectors have not given up protection of salmon from any region. These protectors do everything they can to protect the endangered salmon. First, they decided to remove the four dams on the Snake River in Washington, which hindered the migration of salmon from eastern Iowa and eastern Washington.

Scientists believe that as long as eight of the four dams across the Pacific Ocean and the rivers in the middle of Iowa and the wilderness of Oregon are dismantled, the salmon can survive climate change better. However, the power generated by the four dams cannot be overlooked. The annual power generation is about 1,000 megawatts, which is equivalent to the current electricity consumption in Iowa.

A joint survey shows that the use of high-efficiency energy sources such as wind, solar, geothermal, and biomass will effectively solve the problem of energy supply. White does not agree to dismantle the four dams. However, he also believes that adopting an energy efficient system can meet the electricity demand in the region, but the price may be relatively high.

With regard to the impact of climate change on the Colombian submarine basin, it is impossible to estimate and predict the future of salmon. However, Ford said: “The salmon can use its own strength to survive global warming. I am afraid that humans themselves Can't do this."

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