More time in oven for recyclable trays

Dear Sir, — Our favourite supermarket’s ready meal curries now come in recyclable trays instead of black plastic non-recyclable ones. A good step forward maybe. However, they now need 55 minutes’ oven time instead of 40. So more electricity is needed (+37.5%) so maybe not. Maybe heat transfer through the new trays is slower.
Maybe a more careful thought process is needed in the quest to reduce plastic waste.
Any environmental materials experts reading this might like to comment.
Also, I wonder if maybe the new dual-finish trays need more energy to be made. — Yours faithfully,

BOB LEWIS
Sandbach.

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