OUIL601 - Beginning my research

I know it's a bad source, but I began looking at the Conservation movement wikipedia page to try and help me find different sources to branch out.

The conservation movement is:

-Political

-Environmental 

-Social 

Early conservation movement:

-Fisheries

-Wildlife management

-Water

-Soil conservation

-Sustainable forestry

Contemporary conservation movement:

-preservation of biodiversity

The movement can be traced back to as early as 1662 with John Evelyn's work Sylva, it was published as a book in 1664 and is a highly influential texts on forestry in response to England's depleting timber resources.
The conservation ethic that began to evolve included three core principles: that human activity damaged the environment, that there was a civic duty to maintain the environment for future generations and that scientific, empirically based methods should be applied to ensure this duty was carried out.

I need to find out, what were the causes of the conservation movement, why did it come about? who were the first people to really push it forward?