Progress

Seeing both sides
On one hand ... on the other hand
ex) On one hand, this envention will save many lives ... On the other hand, it produes a lot of waste.

One way of looking at it is ... Another way of looking at it is ...
ex) One way of looking at it is science is our future. Another way of looking at it is science could be the end of us.

Yes, but the flip side of the issue is ...
ex) Of course nuclear power produces a lot of nergy, but the flip side of the issue is that it can be very dangerous.

Well, scientifically speaking ...
ex) Well, scientifically speaking, cosmetic urgery is low risk.

You can't ignore ...
ex) You can't ignore the positive value of genetic engineering.

Expressing compromise
I see your point, but ...
ex) I see your point, but in the wrong hands this technology could be dangerous.

Maybe you have a point there ...
ex) Maybe you have a point there. We could eliminate some testing of cosmetics on animals.

Yes, I suppose you could say ...
ex) Yes, I suppose you could say coputers increase produtivity even though they dehumanize the workplace.

I guess you're right, although ...
ex) I guess you're right and I should write letters by hand, although I still think using the computer is a lot more convenient.