We have enough coal, when converted to liquid fuel, to replace oil for 200 years.

FORBES: Montana Gov. Brian Schweitzer

The bill would allow for the early payment of the winter fuel allowance to people whose homes are not connected to the mains gas grid and whose principal source of fuel is home fuel oil, liquid petroleum gas or propane gas.

BBC: Winter Fuel Allowance Payments Bill

Oil shale and tar sands are other sources of liquid fuel that are harder on the environment than petroleum.

NPR: Will Pricey Fuel Prompt Greener Energy Habits?

And for the first time in more than a decade, oil we imported accounted for less than half of the liquid fuel we consumed.

WHITEHOUSE: America��s Energy Security

Households with oil-fired central heating, and those using solid fuel or liquid petroleum gas to heat their homes, are much more likely to be in fuel poverty than "on-grid" households.

BBC: Winter Fuel Allowance Payments Bill

Allow early payment of Winter Fuel Allowance to pensioners whose homes are not connected to the mains grid, and instead use oil, liquid petroleum gas or propane gas for heating.

BBC: Bill-by-bill: Guide to MPs' private members' bills