They take minutes to send and pollute the planet as a byproduct of their security and decentralization. Anyways, Monero does not contribute much to pollution at all. I guarantee you that you do far more things that pollute the planet in your daily life than a Monero transaction.

MobileCoin is a farcical alternative to Monero, where a few “trusted” corporate nodes are run and 80% of the coin is premined.

and by send I mean network confirmations + generating zkSNARKs on the client. IMO for a payment network to work, my mom needs to be able to use it and not be frustrated. Venmo barely clears that bar

On most clients spending and receiving is instant.

What takes a maximum of 2 minutes on monero is waiting for your received balance to become available.