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优发国际的官网是-优发国际顶级在线登录-优发国际注册app

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优发国际的官网是-优发国际顶级在线登录-优发国际注册app

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优发国际的官网是-优发国际顶级在线登录-优发国际注册app

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优发国际的官网是-优发国际顶级在线登录-优发国际注册app

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Experts say carbon dioxide can be damaging because it can remain in the atmosphere for hundreds of years and in the ocean for even longer.On Monday, at the opening of a climate meeting in Spain, United Nations Secretary-General Antonio Guterres warned that 400 parts per million had once been considered "unthinkable." The UN Climate Change Conference brings together representatives from around the world to seek solutions to reduce greenhouse gas emissionsLast year, the UN's Intergovernmental Panel on Climate Change set a goal for countries to limit temperature increases to 1.5 Celsius or below.The group said this target could be reached by reducing greenhouse gases and restructuring the world economy to expand renewable energy sources.The UN reported last week that the world needed to cut carbon emissions by 7.6 percent each year, every year, until 2030, to reach the 1.5 Celsius temperature goal.The WMO's Petteri Taalas urged the world to quickly launch steps aimed at reducing temperatures before it is too late."If we do not take urgent climate action now, then we are heading for a temperature increase of more than 3°Celsius by the end of the century, with ever more harmful impacts on human wellbeing," he said.Chinese scientist He Jiankui shocked the world last year when he claimed to have helped make the first gene-edited babies.Now, it is unclear what has happened to him and the babies.The scientist has not been seen in public since January, and nothing is known about the health of the little ones.His work has not been published."That's the story — it's all cloaked in secrecy," said bioethicist William Hurlbut of Stanford University in the United States.Hurlbut spoke with He Jiankui many times before He reported on his research at a Hong Kong science conference.He claimed to have used a tool called CRISPR to change a gene in human embryos.His goal was to try to help the embryos resist infection with the virus that causes the disease AIDS."I feel a strong responsibility that it's not just to make a first, but also make it an example," He told The Associated Press last year."Society will decide what to do next," he said.Many experts denounced his work as medically unnecessary and unethical.They said it was unclear what harm the changes might have caused.Since then, many experts have called for better rules or even a ban on similar work.But it is unclear who would set policies and who would enforce them."Nothing has changed," said Kiran Musunuru, a geneticist at the University of Pennsylvania in Philadelphia.Musunuru just published a book about gene editing and the case of the CRISPR babies.Where are He Jiankui and the babies?He Jiankui was last seen in early January at an apartment building.Armed guards were standing nearby, leading some to suspect he was under house arrest.

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