Protesters rally about the Keystone XL oil pipeline along U.S. President Barack Obama's motorcade as he arrives at the Jefferson Hotel in WashingtonBy way of Roberta Rampton and Jeff Mason WASHINGTON (Reuters) – Pressure for President Barack Obama to approve the Keystone XL pipeline from Canada elevated on Friday after a State Department record performed down the affect it will have on climate exchange, irking environmentalists and delighting proponents of the venture. The company made no advice in its record on whether Obama should supply or deny an software with the aid of TransCanada Corp to construct the $5.4 billion line, which would transport crude from Alberta’s oil sands to U.S. refineries. But the State Division mentioned that blockading Keystone – or any pipeline – would do little to gradual the enlargement of Canada’s huge oil sands, sustaining the central finding of a preliminary learn about issued ultimate year.