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Study: Earth hottest in 120,000 years

Study: Earth hottest in 120,000 years

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WASHINGTON — A new study paints a picture of an Earth that is warmer than it has been in about 120,000 years, and is locked into eventually hitting its hottest mark in more than 2 million years.

As part of her doctoral dissertation at Stanford University, Carolyn Snyder , now a climate policy official at the U.S. Environmental Protection Agency, created a continuous 2 million year temperature record, much longer than a previous 22,000 year record. Snyder's temperature reconstruction, published Monday in the journal Nature , doesn't estimate temperature for a single year, but averages 5,000 year time periods going back a couple million years.

Snyder based her reconstruction on 61 different sea surface temperature proxies from across the globe, such as ratios between magnesium and calcium, species makeup and acidity. But the further the study goes back in time, especially after half a million years, the fewer of those proxies are available, making the estimates less certain, she said.

Musk envisions travel ships to Mars

CAPE CANAVERAL, Fla. — SpaceX founder ElonMusk envisions 1,000 passenger ships flying enmasse to Mars within a century, "Battlestar Galactica" style.

During a speech Tuesday in Mexico, Musk outlined his plan to establish a city on Mars. He wants to make humans amulti-planetary species, and says the best way to do that is to colonize the red planet. In fact, he's already begun work on the Mars Colonial fleet. He says the system ultimately could take people to the moons of Jupiter and beyond.

Musk says it would be a "super-exciting" adventure but also dangerous, at least initially. His goal is to get the price down so anyone could afford to go, with a ticket costing no more than a house on Earth. He's shooting for 1 million Martians.

Baby born with DNA from 3 people

NEW YORK — Scientists say the first baby has been born from a new technique that combines DNA from three people.

The goal is to prevent the child from inheriting a serous genetic disease from the mother.

The birth of the baby boy is revealed in a research summary published by the journal Fertility & Sterility. Scientists plan to make a fuller presentation at an October meeting. The magazine New Scientist said the baby was born five months ago to parents from Jordan.

The technique involved removing some of the mother's DNA from an egg, and leaving the disease-causing DNA behind. The healthy DNA was slipped into a donor's egg, which was then fertilized. As a result, the baby inherited DNA from both parents and the egg donor.

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