Re: 2 cm nodule
The types of treatments you can have depends on a lot of things, including the stage of cancer (if that's even what this is) and your overall medical problems, including the severity of your COPD.
If your biopsy does show cancer and all you have is a 2 cm nodule without lymph node metastases, and without metastases to other parts of your body, you would have a stage I (early-stage) cancer. You should ask your doctor to order a PET scan to help stage the cancer (again, if that's even what this is) and to refer you to a thoracic surgeon.
If you are a candidate for surgery, a lobectomy offers a good chance of long-term survival from early-stage lung cancers. If your lung fuction is not good enough for surgery, you may be a candidate for radiation and chemotherapy, or stereotactic radiosurgery such as CyberKnife.