Interestingly this may be a typo as the article mentions cubic meters.
But wiki says cubic tons is a measure of volume that is obsolete in UK and mostly used in the US
Feel free to put in parenthesis the number of British buses or American football pitches, for the older folk from UK and USA if necessary.
But please use units that are universal and scientific!
A terameter is a unit of length equal to 1 trillion meters.
A cubic terameter is 1x10^36 cubic meters.
2 million cubic meters would be something like: .000000000000000000000000000002 cubic terameters
Or: 2e-30 terameter³
If you're wanting minimalconversion, the amount comes to 2 cubic hectometers.