Big Oil cautious about clean-energy spending;
<h3>Critics want more from firms earning billions</h3><p class="source">The San Francisco Chronicle</p>
<p>For BP and other oil companies reaping record profits, research on new energy sources is far from their biggest investment. BP's earnings hit $22 billion in 2006. The company spent $15.5 billion during the year buying back its own stock, almost twice what it may spend on renewable power and alternative fuels in a decade. Many renewable-energy advocates say that, for now, oil company commitment to alternative energy remains relatively small.</p>
