Sentences with phrase «occurred over the past several decades»

The observed global greening has occurred in spite of all the many real and imagined assaults on Earth's vegetation that have occurred over the past several decades, including wildfires, disease, pest outbreaks, deforestation, and climatic changes in temperature and precipitation, more than compensating for any of the negative effects these phenomena may have had on the global biosphere.

In recent years, many have expressed concerns that global terrestrial NPP should be falling due to the many real (and imagined) assaults on Earth's vegetation that have occurred over the past several decades — including wildfires, disease, pest outbreaks, and deforestation, as well as overly - hyped changes in temperature and precipitation.

Not exact matches

Several large severe wildfires have occurred in the state over the past decade, leading some to hypothesize that the beetle's destructive spread may be a contributing factor.

In the past several decades, scientists have discovered that the North — South distributions of certain plants often result from a single jump across the tropics, not as a result of gradual movements or events that occurred over a hundred million years ago.

Attempts to reinvent high school have occurred regularly over the past several decades.

There are two prominent and undeniable examples of the models» insufficiencies: 1) climate models overwhelmingly expected much more warming to have taken place over the past several decades than actually occurred; and 2) the sensitivity of the earth's average temperature to increases in atmospheric greenhouse gas concentrations (such as carbon dioxide) averages some 60 percent greater in the IPCC's climate models than it does in reality (according to a large and growing collection of evidence published in the scientific literature).