Examine Rio Tinto's annual reports for 2019, 2020 and 2021 and explore the following:

Over the period 2019 to 2021 how have ESG/CSR/sustainability disclosures changed? IF they have, do you have an opinion on why you think this is the case? ALL items of ESG can be considered here and evidence of Greenwashing should be considered, including whether the ESG information is useful for decision making in this instance.