Carbon dioxide is responsible for major man-made greenhouse effect, making it the most important contributor to climate change.
The evidence regarding the effect of man-made chemicals on breast cancer is thin and is complicated, for example, by the fact that it is very difficult to determine which chemicals women have been exposed to over their lifetime.
After all, what do pre-industrial world temperature trends have anything to tell us about the effect of man-made Co2 on 20th century temperatures?
However, we have not been able to identify studies of the ripple effect of man-made disaster on mental health in low-income countries.
The effect of man-made barriers on genetic diversity and population structure in a river system must therefore be evaluated against a multivariate model accounting for the system's natural levels of genetic drift and gene flow simultaneously.
The effects of huge man-made projects like TGD on fauna and macrophyte are obvious, mainly through changes of water dynamics and flow pattern; however, it is less clear how microorganisms respond to such changes.
The effects of man-made chemicals on the endocrine system have been studied for decades, but their relevance for human health has only recently been acknowledged.
The power to artificially override the natural cycle of light and dark is a recent event and represents a man-made self-experiment on the effects of exposure to increasingly bright light during the night as human societies acquire technology and expand industry.
In particular, the effect of man-made drainage modifications on hydrodynamic attenuation and consequent wetland evolution is poorly understood.
There is international concern regarding the effects of natural and man-made chemicals on the health of humans and wildlife.
Yet, practical problems arise where the effects of man-made alterations in the hydrological environment on ecological communities need to be known.
