Blaming "big corporations" for our woes looks pretty unconstructive to me. Most big corporations got big by giving consumers what they want. Trying to reduce emissions through big corporations (AFAICT the focus will be largely on energy, transport and construction) means making their products more expensive, which always triggers responses of regressiveness / inequality, short-circuiting the whole debate.

Put in another way: regardless whether execs at the oil and flight companies are to blame, or their flying and driving customers, a solution must involve large reductions in the amount of fuel burnt (which inevitably requires making that much more expensive than it is now).