Sentences with phrase «altered by human activity»

But the level of CO2 has been drastically altered by human activity, rising from 280ppm at the start of the industrial revolution to 400ppm today.

One of the definitions of «virgin» in the Merriam - Webster pocket dictionary is: «fresh, unspoiled; especially: not altered by human activity.»

Today's forests have been greatly altered by human activity and face increasing threats from drought, insect infestations and fire.

In fact, in a world that has been dramatically altered by human activity, many could be important allies in rebuilding healthy ecosystems.

Second, the rate of warming between 1880 and 1940 was not as severe as it has been since 1980, and morever, biomes across the planet have been radically altered by human activities muc more during the latter period (e.g. especially since 1950).

Not exact matches

The March 12, 2015 issue of Nature magazine contains an essay — not an original thesis, rather a summation — by two English geographers entitled «Defining the Anthropocene,» the subject of which is whether (and starting when) human activity has so altered the global environment as to constitute a new geologic age: the Anthropocene Age, as successor to the 11,000 - year Holocene Epoch that is itself part of the larger 2.6 million year - old Quaternary Period (or Great Ice Age).

Many thoughtful citizens, including eminent scientists, oppose the deciphering and altering of the human gene structure, and are appalled by the proposed commercial uses of knowledge gained from such activities.

The researchers further found that miR - 486 is itself regulated by the tumor - suppressor gene p53, the most frequently altered gene in human cancers, and that activity of miR - 486 is partially dependent upon functional p53.

The new data — from animals and human cells — show that the vapors released by e-cigarettes can alter the activity of genes.

«It's a more complicated picture, but broadly it means that there are going to be winners and losers in the oceans as its chemistry is modified by human activities — this could have the effect of altering major ocean ecosystems on which both we and a large part of marine life depend.»

Lead author Dr Debbie Polson, of the University of Edinburgh's School of GeoSciences, said: «This study shows for the first time that the drying of the monsoon over the past 50 years can not be explained by natural climate variability and that human activity has played a significant role in altering the seasonal monsoon rainfall on which billions of people depend.»

Brought to You by SEPP (www.SEPP.org) The Science and Environmental Policy Project ################################################### Quote of the Week: «a change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over considerable time periods.»

Climate change is defined by the Convention as «change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods» (article 1 (2)-RRB-.

It is also defined by the United Nations Convention on Climate Change as «change of climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere and which is in addition to natural climate variability observed over comparable time periods»

The scientific consensus amounts to this: (1) climate is changing (2) human activities contribute to it, (3) nobody can say for sure what fraction of (1) is accounted for by (2), or how much impact we can have by altering human activities.