The link between the sun's activity and climate involves another lot of particles streaming past the Earth.
These proposals and analyses do not require you to agree with the compelling scientific evidence that human activity is producing climate change.
Some of these phenomena are not new but are aggravated by cumulative pressures such as climate change, intensified human activity and technological advances.
Climate change is unequivocal and human activity plays some part in it.
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Melting glaciers, hotter summers and migrations of plants, animals and even deadly microbes have convinced virtually every climate scientist on earth that human activity has indeed started to warm the planet.
In his speech, Bush acknowledged that climate change is real and that human activity is a factor.
The draft curriculum for geography does not contain references to climate change but a section called "Earth science" in the chemistry syllabus says 11- to 14-year-olds should be taught about "the production of carbon dioxide by human activity and the impact on climate" and includes a section on "the efficacy of recycling".
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He said that polls had shown only 14% of Republicans accepted that climate change was real and caused by human activity compared with 60% of Democrats.
It is, after all, really a question of technology and costs: the use of fossil fuels, and not economic activity, is to blame for climate change.
Many of Burke's descendants find it difficult to believe that something as big as the earth's climate could really be at risk from human activity, and even harder to think you could do something about it.
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The IPCC Panel's near-consensus was that human activity is having some discernible impact on climate, and that by 2100, a warming earth could result in more frequent storms and droughts, sea level rise of up to three feet, and up to six degrees F. in temperature rise.
With respect to carbon emissions, I share the view of your Prime Minister and most scientists in the world that climate change is a real problem and that human activity is contributing to it, and that we all have a responsibility to find ways to reduce our carbon emissions.
Climate change was first proposed as a consequence of human activity in 1895.
Some of the warming is obviously the result of human activity, but our effect on the global climate remains unclear.
Climate alarmists again said they were caused by pernicious economic activity.
Here we examine the strikingly large global interannual variability of TC ACE during the past 40-years and shed light on the large-scale climate mechanisms responsible for the recent historical downturn in TC activity.
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"It seems to me that the current international financial difficulties serve only to reinforce the message that positive action to tackle climate change could in fact be a stimulant to economic activity, " he added.
Climate scientists have already looked at changes related to Sun spot activity - a cycle of approximately 11 years - and long-term changes in the Sun's brightness, which has a cycle that lasts for centuries.
This worrisome predilection has only been whetted by the failure at Copenhagen, and we can anticipate far more activity in 2010 and beyond, not only on climate change but in a host of areas traditionally considered "domestic" policy (such as abortion, firearms control and the death penalty).
The research indicated that influences in solar changes and intermittent volcanic activity have accounted for at least 80% of observed climate variation over the past half century.
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With such approach, natural anomalies can be assessed in relation to those caused by mining and related industrial activity, taking into account the geology, topography, climate, vegetation and hydrology in different regions of Africa.
The book expresses the growing concern among more careful real climate scientists, rather than political scientists, that trends in solar activity portend a return to the cold, limited agricultural output, and widespread disease of the Little Ice Age, or even a more full blown, overdue by historical standards, real ice age.
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The outlook issued last week by the Climate Prediction Center at the National Oceanic and Atmospheric Administration calls for "considerable activity" this hurricane season in the Atlantic.
These match climate models' predictions of what happens when warming is induced by greenhouse gases better than it matches predictions of the result of changes in the sun's activity, the main alternative hypothesis for what might be causing the climate to change.
Now he warns, human activity in the space of less than 200 years threatens to re-awaken extreme climate change of the sort never experienced in the era of recorded history.
No doubt, the topic of climate change is contentious and some scientists are unable to make the link between global warming and human activity.
As noted in the paper, the IPCC models also fail to incorporate climate modulating effects of solar changes such as cloud-forming influences of cosmic rays throughout periods of reduced sunspot activity.
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