Flying with TAP via Lisbon could cut down your air miles and carbon footprint depending on your final destination. While other carriers fly into either Rio or São Paulo in the Southeast (BA go direct to both from Heathrow), TAP has flights to many other Brazilian cities, meaning you can fly into the northern beaches and back home out of the southeast without having to double-back and burn more fuel.
Brazil is bigger than Australia and there are no intercity train services, so to get the most out of a visit, you will need to fly. The country has an extensive domestic network. For the greenest flights, use local carrier Azul, whose new Embraer E2 jets are the cleanest small jets in the world, cutting emissions by over 30 per cent from previous generation aircraft. Intercity buses are also frequent, cheap and comfortable.