We will attempt to establish the validity of assertions around these impacts through the use of appropriate data sources; and asking those who make them to offer evidence to support them.
Byddwn yn ceisio canfod dilysrwydd honiadau ynghylch yr effeithiau hyn trwy ddefnyddio ffynonellau data priodol; a gofyn i'r rhai sy'n eu gwneud i gynnig tystiolaeth i'w cefnogi.