You're right... it was once described as the highest junkyard in the world.
Though the Nepalese government is now taking stringent measures to curb the pollution there. I read somewhere that climbers are required tp make a deposit of i think $4,000 which is only refundable if they return with the same quantity of gears they went up with.
There's still more to be done.
RE: Getting to the Summit of Mount Everest. Part 1 - Getting to know the Sagarmatha