There are lots of ways to have a contract, but one example of why this is done is if you have oil and on a slow boat. When the oil is loaded onto the boat the well owner wants to be paid, while the ship owner doesn't want to buy it, and the destination does not doesn't want to pay for it. This the ship will pay for the oil by selling a contract, the ship already knows where it is going, but they don't want to have ownership of the oil. By selling the contract on the same day they get their money back and don't lose money if oil goes down. Then they sell the oil on the other end and pay off the contract. Of course in the real world it is more complex but in general the destination is already known what isn't known is how much the oil will be worth when it gets there.
Note that I said hard to take delivery when you don't want it. Such things do happen despite safeguards. They are expensive mistakes for everyone (the ship delivering oil can't unload and so will miss the next dock while running for someplace that can take it), so there is a lot of checks in place but they can fail.
READ THE EPA STATEMENT..
https://www.epa.gov/sites/production/files/2020-03/documents...
> The enforcement discretion described in this temporary policy do not apply to any criminal violations or conditions of probation in criminal sentences.
...
> This policy does not apply to imports.
They are relaxing REPORTING requirements - not giving a free pass to anyone dumping whatever they want. Obviously.
> IV. Accidental Releases Nothing in this temporary policy relieves any entity from the responsibility to prevent, respond to, or report accidental releases of oil, hazardous substances, hazardous chemicals, hazardous waste, and other pollutants, as required by federal law, or should be read as a willingness to exercise enforcement discretion in the wake of such a release.
https://www.epa.gov/sites/production/files/2020-03/documents...
> The enforcement discretion described in this temporary policy do not apply to any criminal violations or conditions of probation in criminal sentences.
...
> This policy does not apply to imports.
They are relaxing REPORTING requirements - not giving a free pass to anyone dumping whatever they want. Obviously.