Solar activity 'not linked to global warming'
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Â· Study undermines climate sceptics' arguments Â· Correlations 'inconsistent' with temperature rise
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On New Year's Day, let us contemplate signs of future weather. In my Findings column, I argue that "availability entrepreneurs" have been exploiting short-term weather in order to awaken the public to what could be a real long-term danger, global warming. Hurricanes, blizzards, floods, droughts, exceptionally hot years â all these have been linked to [...].
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LONDON, Oct 11  - Climate experts cautioned Monday that a reported consecutive annual jump in the quantity of carbon dioxide in the atmosphere might be an anomaly, without ruling out it was a sign of rapid global warming.
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A Bush administration report suggests that evidence of global warming has begun to affect animal and plant populations in visible ways, and that rising temperatures in North America are due in part to human activity.
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Science & environment: The energy from some micro power equipment would not operate a lightbulb, says official study
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By Julie Sevrens Lyons, San Jose Mercury News, Calif.  SJ-0524-Global-warming-enlarging-San-Francisco-Bay-scientists-say   Global warming enlarging San Francisco Bay, scientists say   Julie Sevrens Lyons  San Jose Mercury News, Calif.
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The public believes the effects of global warming are not as bad as some experts claim, a poll suggests.
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Science & environment: Britons know that the planet is heating up - but are still not ready to change their lifestyle
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Extreme PlanetThough both rovers are exploring Mars well beyond their initial 90-day missions, electrical connections and moving parts are showing signs of temperature-related fatigue.&quot;Every day we have a huge thermal cycle,&quot; notes Jake Matijevic, chief of the rover engineering team. &quot;That causes the solder in electrical connections to expand and contract until it breaks.&quot;Seasonal ChangeDuring their exploration of Mars, the rovers have recorded temperatures ranging from midday highs of about 35 degrees C. (95 degrees F.) in spring and summer to nighttime lows of about minus 110 degrees C. (minus 166 degrees F.) in winter. Spirit has experienced greater swings in temperature because its location is farther from the martian equator, which puts it seasonally closer to or farther from the Sun than Opportunity.Three Years of DataRover engineer Dan Porter has been tracking temperatures recorded by 50 or so sensors on each of the rovers since shortly after they landed on Mars in January 2004. The results are not only of interest to scientists, they're a favorite of human audiences as well.&quot;People ask about this all the time,&quot; says New Mexico geologist Larry Crumpler, a member of the Mars rover science team who created the charts showing monthly average temperatures superimposed on panoramic-camera images from each of the rovers. &quot;These plots of daily temperature are destined to become an important part of all my public outreach talks.&quot;Cold vs. ColderJust as on Earth, temperatures on Mars are not uniform everywhere. Objects exposed to direct sunlight are apt to be warmer than those in the shade. Some objects retain heat better than others. A source of relative warmth on Mars is rocky terrain, because it retains heat better than sandy terrain.A solar panel is sort of like a &quot;warm wall in mid-winter,&quot; says Crumpler. Components beneath the solar panels, such as the hazard avoidance cameras, are closer in temperature to the martian air. Unlike Earth, Mars does not have a thick, atmospheric blanket to seal in warmth by night or minimize the Sun's heat by day.Wear and TearEngineers have traced stalls in a shoulder joint on Opportunity's robotic arm to a broken electrical wire. The shoulder motor has experienced greater temperature swings than other parts because of its location beside a heater that has been stuck in the &quot;on&quot; position since shortly after landing.Notes Matijevic, &quot;Our theory is that one of the wires in the electrical coil broke free and disabled the motor.&quot;Mechanical ProblemsExtremely cold temperatures have also caused mechanical problems. Recently, Opportunity's right front wheel began drawing excess electrical current, reminiscent of Spirit's right front wheel in 2004. The demand for more electrical current suggests that the wheel motor is working harder than usual. Engineers suspect that, like motor oil that can't handle freezing temperatures on Earth, gelid lubricant failed to flow properly and caused Spirit's right front wheel to fail.Adjusting ExpectationsRover drivers have compensated for Spirit's stuck wheel by driving on the other five wheels. They have compensated for Opportunity's stalled shoulder joint by unstowing it before going to sleep at night. This way, if the motor fails during the night, when temperatures are at their lowest, they would still have limited use of the arm by operating the remaining working joints. Each rover has lost a few temperature sensors as well, while dozens more continue operating.Time Will Tell
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Hurricanes and typhoons play a significant role in distributing the ocean&#39;s heat, say US researchers, who believe they have uncovered a major, but hitherto-ignored aspect of global warming.
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Global Warming is a hot topic that shows little sign of cooling down. Earth's climate is changing, but just how it's happening, and our own role in the process, is less certain. Includes photo gallery.
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Contrary to previous belief, sunlight reduces the risk of developing tumours in the lymphatic glands, according to a Swedish study.
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Research suggests that changes in the Sun's activity cannot be responsible for modern-day global warming.
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NASA Administrator Michael Griffin says that although global warming is changing Earth's climate, he's not convinced that is "a problem we must wrestle with."
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CNET News.com's Charles Cooper says there may be good reasons why we donÂt want to know about global warming. But time is running short.
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Warmer temperatures in North America since 1950 were probably caused in part by human activity, the Bush administration said in a report that appeared to contradict the White House position there was no clear scientific proof on
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Global warming could cut a swathe through the planet's species over the coming centuries, warns a study released Wednesday that shows a link between rising temperatures and mass extinctions reaching back half a billion years.