Indeed, unlike diseases such as smallpox and polio, most zoonotic diseases cannot be eradicated through intensive human vaccination campaigns.
The most immediate threat to dryland areas is desertification -- the thinning out of vegetation -- brought on by intensive human settlement of lands prone to drought.
These areas were chosen in part because natural patterns have not been obscured by long histories of intensive human agricultural impacts.
We watch workers digging out layers of the stuff with no greater resources than their 19th-century forebears, as they fill sack after sack in the most basic and intensive human labour.
"The highly specialised rainforest biodiversity in many protected areas is facing profound threats as their surrounding lands are being hit by a tidal wave of logging, fires and intensive human land-use," he said.
In areas free from intensive human activity, such as in rugged landscapes and in the oceans, the process of cordoning off protected areas for wildlife had been easier to achieve, provided that the political will to do so existed.
Maintaining wild places increasingly involves intensive human interventions.
The conventional border patrol systems suffer from intensive human involvement.
Rainfall distribution has become highly erratic due to climate change and intensive human activities.
Intensive human activities will lead to an abrupt change in runoff series.
Globally many freshwater ecosystems are degraded because of intensive human activities, so water ecosystem restoration is a burning issue worldwide.
