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When doing cardio, your body has 2 sources of energy to choose from...glycogen/glucose and/or fat. When lifting, the body has virtually 1 source of energy - glycogen/glucose.
If you do cardio (extensive, not warmup) before lifting and burns up the glucose before you start lifting the body has to get more glucose (Muscle can make glucose for the body.)
If you lift and then do cardio, lifting burns up glycogen before starting cardio meaning your body has to use the other source of energy (FAT)
The thing is if you do the same things every day you get less caloric expenditure from them. Also, as you lose weight the number of calories expended from an activity declines. Therefore you should vary training to keep your body from getting accustomed to it (every 2-3 weeks).
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