Habitat destruction and chemical usage seem to be the big two that are causing the majority of wildlife decline. We have to take our own pee pee steps rather than wait for government to change, it's always too little too late! When it comes to consumerism, cutting back on our use of ethanol gasoline for one example might help, but commercial crops producing the corn to make it used to exist side by side without the huge reprecussions to the natural environment we see now.

IN regards to chemical use


Here's where I see the picture changing drastically: INTRODUCTION of GMO(genetically modified organism) There's plenty of argument that mankind playing with DNA has always been in place without too many problems. This is only a little true in my opinion, there are plenty of problems, but that's a whole 'nother discussion.
See below examples of human modification to just one type of garden plant:
Annabelle Hydrangea feeds the human eye only, no wildlife benefits

Natural wild hydrangea feeds insect eye

Can you see the difference?

Back now to chemical intervention by mankind:
The big sin is creating crops genetically that can be blasted to hell and back with Roundup chemical. We were eating this stuff too without being told about it! There's no longer any doubt that humanity's tinkering in the natural world is way out of control. In the age of information, we can't keep walking in ignorance lest we drive ourselves into extinction right behind the other creatures of the earth.

IN regards to habitat destruction

Again, we need to take our own small steps, regulating ourselves. The biggest thing I am able to do personally is to create habitat on my own property and not add to urban sprawl by shopping only in a few places. In my area, land keeps getting ripped up for more and more commercial spaces we just don't need. Seriously, how many strip malls and car lots are enough to keep us supplied?