Because that's still geological carbon entering the overall cycle on the surface. The air and ocean are giant buffers of it. When it's needed it needs to be pulled from there somehow (such as by felling trees or directly extracting CO2). Unfortunately that's not economical when it's legal to tap the giant lakes of it sitting underground.
Many of the other things (plastics esp) are byproducts after refining for fuel. If the fuel isn't consumed, the byproducts would become cost ineffective.
Don't "worry" though. Oil consumption is going up not down.
I fully support removing DST (as a parent at least, it's a PITA twice a year).
However, clocks should show noon correctly, as best as they can within your chosen timezone. Also, I really like long evenings in the summer to get outdoors and go biking or hiking. It follows that we should abolish DST, stick to the correct time, and move regular school and business hours back one hour.
School and business hours are already fairly arbitrary where I live. The only places observing "standard" hours seem to be banks and even many of those stay open later in the evening these days. Meanwhile the schools do everything based on juggling a limited number of busses meaning that start and end times are staggered over a period of 3+ hours. You see evidence of this in traffic patterns as well. It starts early with the trades and runs well into the late morning due (AFAIK) to tech.
