Adr and gdr

1. If you as an Individual want to invest in a Company which is situated in America, you cannot be a Shareholder, instead you get American Depository Receipts. Its nothing but an investment receipt, like a Share Certificate.

2. Similarly, If you want to invest in a Company situated outside India (Except America), you get Global Depository Receipts.

3. I don't know about Carbon Credits, sorry!