However, the long-term trend is for plant life to die off altogether.
Some long-term trends have made the region more like the rest of the nation.
Whatever the pain now, few in the industry think the decline is the start of a long-term trend.
It often signals the end of a long-term trend, they say.
But he declined to say whether that was a long-term trend.
What's more, some studies on fish and other animals have found no long-term trend toward bigger.
Most big oil companies, however, now try to base their projects on long-term trends in prices.
The book reported a study of long-term global trends in population, economics and the environment.
The important question, of course, is whether these long-term trends will continue.
Besides these factors, some say other, long-term trends have come into play.
