It's the same problem all over. People using pesticides and wasp/bee killing sprays are making these critters extinct. People don't realize how important they are.

What I did, we picked a spot in the garden and planted a plant called Snow Square Stem aka Malanthera niveaanted it grows into a nice bush and you can trim it back if you want to. This attracts bees to the bush. Here is a picture:
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I see many bees, mostly bumblebees, in our yard, every summer. We grow blueberries, and the bees are essential pollinators for these shrubs. Along with the bumblebees, I see a few honey bees, and also a smaller iridescent green bee. I have a small patch of everbearing raspberries, and these blossoms are very often visited by the bees, after the blueberry blossoms have turned into berries. I am not seeing any decline in bee population, however, we live in town, in Madison, Wisconsin. Our local bees live in the backyards of our neighborhood, so they might not be exposed to heavy application of insecticides used in agriculture.

We still see lots of bees in our yard, though there were very few to be seen at the beginning of this past season. My personal theory is that most of our bees were coming from one hive, and that it got killed off, either by a disease or by construction going on near us. We also get quite a few bumblebees (or did in warmer weather).
Some of the top bee-attracting plants in our yard are a mound of oregano, our (highly invasive) raspberry bed, the chives that were here when we moved in and are still there, and the dahlias that we have.
-Jmcat

I must disagree with your theory that pesticides are responsible for 'killing ALL the bees'. Extensive research has been done on "CCD" Colony Collapse Disorder and pretty much ruled out pesticides. This does not excuse irresponsible use of those products but we can't simply lay all the blame for that and every other problem in nature at its feet. Here's an excellent article. Believe me we NEED to find the answer. Bees are to valuable to us to lose.

Here is a link that might be useful: Where have all the bees gone?

I see many different species of bees in my yard, where I grow many organic gardens with mostly native plants, and purposely grow flowers for the pollinators. If the bees (or hummers, etc.) really love it, I will plant more! There is also habitat for some of the native bees to nest here.

In the local neighborhood, many of the residents have gardens and there are 3 local farms and a nursery, all of which grow lots of flowers. There is some conciousness about organic gardening although I know people use pesticides to an extent. Overall it seems the bees are alive and well in this little corner of the world.

According to a local farmer, Colony collapse disorder CCD is not so much a problem in the Northeast US anyway.

Have they ruled out the increase in spraying for mosquitoes?