Rex Tillerson

*Meeting included AT&T, Honeywell, Northrop Grumman CEOs. The White House has elevated the issue after efforts to improve U.S. cyber defenses through new laws failed in Congress last year.

LONDON, March 5- The battle over U.S. approval of the Keystone oil pipeline shows the difficulty in regulating carbon emissions through the supply of crude oil, barring an unlikely global agreement to curb demand.

*Exxon to decide between Kurds and Baghdad. ARBIL, Iraq, Jan 30- Behind the closed doors of their offices in the United States, top executives and lawyers for Exxon Mobil are poring over two sets of contracts, weighing a decision that could shift the balance of power in Iraq.

LONDON, Jan 29- Iraqi Kurdistan said it is negotiating with two or three major international companies to operate oilfields and expects to announce the outcome in about a month, in a move likely to further heighten tensions with Baghdad.

LONDON/ ARBIL, Iraq, Jan 23- Exxon Mobil may be moving closer to Baghdad's side in its bitter feud with autonomous Kurdistan, industry sources said, with a sweeter deal to keep it operating in southern Iraq on the table.