Or perhaps, they chose to stay hidden from the daily flurry of human activity.
In the end, the most deadly aspect of human activity may simply be the pace itself.
She said it was important to minimize human activity around beach areas used by nesting leatherbacks.
Barnett authored a research paper linking drought conditions in the American West to increased human activity.
Our relations have been transformed, and today they encompass cooperation in all areas of human activity.
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About 40% of the nitrous oxide emitted is from human activity, according to WMO estimates.
Archives are the by-products of human activity retained for their long-term historical value.
"What we see today is 100 percent due to human activity, " said Tans, a NOAA senior scientist.
In his speech, Bush acknowledged that climate change is real and that human activity is a factor.
Human activity is thought to contribute about 7 billion to 8 billion tonnes of carbon dioxide every year.
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David Koch told New York that he was unconvinced that global warming has been caused by human activity.
Half of my work is how to make our human activity more friendly to the rest of creation.
Careful planning and reforestation efforts could reduce the effects of pipelines, wind turbines and other human activity, scientists said.
But in the longer term the damage caused to the forest by human activity could have even greater repercussions.
Climate change was first proposed as a consequence of human activity in 1895.
But human activity and mismanagement undoubtedly intensified the destructive effects of the floods.
Modern day Nice sits on what is thought to be some of the first evidence of human activity in Europe.
Some of the warming is obviously the result of human activity, but our effect on the global climate remains unclear.
Muller conceded that the study's remit did not extend to questions about how much warming has been influenced by human activity.
These proposals and analyses do not require you to agree with the compelling scientific evidence that human activity is producing climate change.
Why should anyone care, Heatley asked, whether forest creatures get replaced by invasive plants and animals that can better tolerate human activity?
What makes these new technologies unsettling is that they replace human activity.
Every human activity, endeavor, or career path involves the mastering of skills.
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Climate change is unequivocal and human activity plays some part in it.
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It is hoped that here the eggs and chicks will be safe from tides, human activity and predators such as gulls or foxes.
According to a recent article from Scientific American, agriculture is responsible for one third of global greenhouse gas emissions from human activity.
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Some of these phenomena are not new but are aggravated by cumulative pressures such as climate change, intensified human activity and technological advances.
Only 28% of respondents 65 and over thought there was solid evidence the earth was warming because of human activity, versus 42% overall.
Meanwhile, outside of that claustrophobic feedback loop of our face and our screen, the physical systems of the earth are degraded by human activity.
No doubt, the topic of climate change is contentious and some scientists are unable to make the link between global warming and human activity.
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