Tough to see at that angle. is it moss or lichen?

Both will rinse off with forcible water stream. If left to long, Lichen tends to take some roofing granular with it.

There are cleaners on the market, and once clean a strip of copper flashing at the top which will eventially turn green will stop it from happening.

I don't think it is lichen. All I know is they are green and mostly on the edge of the shingle. Actually this side of the house is the sunny side. It gets really hot. But the green stuffs are only on half of the roof. These two pictures aren't much better. Will they go away when the temperature warms up.

Hi, moss will come off fairly easily with a solution of bleach and water, but unless you remove e.g. either the overhanging branches of whatever tree is keeping the area shaded (if there is such a tree), or orient your home to have that part of the roof in more sun more often, the moss will come back. However, it looks to be quite a minimal amount, and in any case it won't really hurt your roof to begin with, not unless it gets to be a really thick mat and begins to hoard water for any length of time.

I had both moss and lichens growing in abundance on my
shed roof, (the moss is a brighter green). I got some
Clorox that is designed for outdoor use, (cleaning wood
decks, etc.) and applied it liberally, using a pump up
garden sprayer. Then I just left it alone and the next
couple of rains washed it all off. Although the directions
on the jug gave different dilution formulas, I applied
it full strength. I had tried diluting it with water
in the past and it didn't seem to work well.

I found an article on ask the builder.com about removing moss on a roof.

Here is a link that might be useful: ask the builder - moss removal

I contacted my roofer. I don't want to void any warranty. So they are going to call me back to tell me what I should do. As you can see the moss is only on the right side of this roof slope. Except for a small piece of overhang roof, that is the only place I can find these green moss.

Home Depot sells a product that you attach to your hose that will take care of that. It generally grows on slopes that receive little or no Sun. It will be a reocurring problem that will need to be addressed every few years.
Ron

Zl700 gave the best advice regarding using the copper strip at the top. There is also a galvanized strip specifically designed for this issue that you can install along the roof line just under the shingles, a few rows of shingles above the growth and staining. It will lengthen the maintenence intervals as ron6519 pointed out. Shingles of that type have a high limestone content (since asbestos is no longer allowed) and the moss will feed on it. They will, over time, deteriorate the integrity of the roof. The bleach does work but you will have to do it on a regular basis. The higher cost (and more effective) products that one would spray on contain copper sulphate and last much longer. Keep in mind, the copper sulphate will damage or kill plants that any overspray may contact. Copper sulphate is one of the products used in killing tree roots from sewer pipes and drains