Gloomy Greens argue that unrestrained human activities can, by changing the climate, doom humanity to extinction.
And scientists say that some of that rise is undoubtedly being driven by human activities.
Direct impacts of climate change on natural processes may be exacerbated by human activities.
That there are multiple natural and human activities happening in tandem and having various, complex effects on the climate?
Some scientists argue that human activities are irrelevant to climate change, and that attempts to reduce any impact are misconceived.
The only human activities in the core area are sightseeing and visits to the Woljong Temple, an old historic relic.
The interconnections between water and climate are complex and not isolated from other forces, pressures and opportunities generated primarily by human activities.
Despite threats to the ecosystem caused by drought and human activities, it is home to a remarkable variety of flora and fauna.
The dominant cause of the warming since the 1950s is human activities.
All human activities are a compromise so we should acknowledge such compromises, not only focus only on either the good or the bad.
One is the realisation that many human activities, not all of them savoury, happen for exactly the same reasons as in other species.
Indeed life, as well as the environment and most human activities, depend on the availability of adequate quantities of water of an acceptable quality.
Human activities are to blame, Jarraud says, and temperatures are "rapidly approaching" a level which scientists believe could kick-start "far-reaching and irreversible" climate change.
Groundwater response to global changes is a complex function that depends on climate change and variability, topography, aquifer characteristics, vegetation dynamics, and human activities.
Now more than ever, there is a need to increase our knowledge of the feedbacks between climate, ocean and changes induced by human activities.
Terns and gulls breed on islets unspoiled by human activities.
However, more serious rates of up to hundreds of metres per year have been observed locally, especially when the process has been created by human activities.
"The atmospheric burden of greenhouse gases due to human activities has yet again reached record levels since pre-industrial time, " said World Meteorological Organization Secretary-General Michel Jarraud.
Among the key findings of the World Resources Institute's Reefs at Risk report is that 58 percent of the world's reefs are potentially threatened by human activities.
Around 60% of methane released into the atmosphere comes from human activities such as farming, rice agriculture, fossil fuel exploitation, landfill and biomass burning, according to the WMO.
In 2009, nations - through the Unep Governing Council - agreed to launch negotiations to establish a legally binding treaty that would cut mercury emissions from human activities.
Virtually all of our most prestigious scientific and academic institutions have stated that climate change is happening and that human activities are the driving cause of this change.
The direct results of human activities on the ocean and through climate change are causing the blue part of this blue planet to warm, rise, and lose oxygen.
And if so, which, exactly, human activities are causing it?
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Rarely addressed in the context of climate change, future population trends could make the difference between success and failure in the long-term balance of human activities, atmosphere, and climate.
Observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver.
There are limited human activities in the buffer zone, and the transition area, which includes forests, plain areas, wetlands and many rivers, is where most economic activities take place.
Thus, the physical, chemical and biological characteristics of lakes and reservoirs can be viewed as a type of barometer of the consequences of human activities within their surrounding drainage basin.
Geological surveys show America has enough saline rock formations to store three trillion tons of carbon dioxide enough for the next 500 years at the country's current output from human activities.
In six of the seven, there was sufficient evidence to conclude that climate change caused by human activities played a factor in the events affecting their severity, likelihood or frequency.
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