Chainsaws don't use diesel fuel. They use regular gasoline mixed with "two cycle" oil. Some have electric motors instead. Might even be some battery powered ones. Although I'd hate to have to lug around either a battery powered one, or one with a diesel engine, which are heavier than comparable power gasoline engines. Two cycle gasoline engines (cars use 4 cycle engines, lawnmowers may use either) are lighter, and can be operated at all attitudes.
Diesel to burn the brush, ya big dummy
geez...lol