Enviro groups plan to oppose the proposed merger of Mobil and Exxon at the companies’ annual meetings this week out of fears that Mobil’s more conciliatory stance on climate change will be x-ed out if Exxon gets regulatory clearance to buy Mobil for $75 billion. Mobil was initially critical of the Kyoto climate change treaty, but last year the company appeared to start changing its tune, saying it would conduct an inventory of its greenhouse gas emissions. Exxon continues to deny that climate change is underway.