1.   Although countries agree action is needed, huge differences exist on issues like whether to cover existing stockpiles or just to ban future production.

2.   Although countries agree action is needed, the talks face huge differences on issues like whether to cover existing stockpiles or just ban future production.

3.   But there was no movement toward narrowing the differences on real issues like whether any potential deal will cover existing stockpiles as well as banning future production.

4.   The talks are expected to last up to five years because of differences on whether to cover existing stockpiles or just ban future production.

5.   The talks are expected to last up to five years because of huge differences on issues like whether to cover existing stockpiles or just ban future production.

6.   The talks face huge differences on issues like whether to cover existing stockpiles or just ban future production.