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It was 19 years ago this month that the earth shook so violently under Santa Cruz and San Francisco that portions of a major highway and a segment of the Bay Bridge collapsed. Sixty three people died. Even though we generally are aloof to the possibility of a major temblor, the reality is we are surrounded by active faults and one East Bay faultline has geologists particularly worried.

Proposition 7 is all about renewable energy generation. The initiative requires all utilities to generate 20 percent of their power from renewable energy by 2010 and 50 percent by 2025 and speeds up approval of renewable energy plants. You would think most leading environmental groups would be on board -- but many are not.

As emblematic of Northern California as cable cars and cracked crab, sea lions are a big attraction at San Francisco's Pier 39 and Monterey's Cannery Row. But many of these animals are getting sick from a bacterial infection that seems to be on the rise this year.

Imagine traveling from San Francisco to Los Angeles in about two-and-a-half hours, without getting on a plane. That's the idea that could become reality this November. A $10 billion bond project is on the ballot to build high-speed rail. With higher gas prices and concern about climate change, supporters hope the time is finally right to approve this massive mass-transit project. But technical and political obstacles remain.

When we think about what happens to our brains as we age, one disease tends to dominate our thoughts and fears: Alzheimer's. In fact, Alzheimer's only accounts for about half of degenerative brain diseases. Many others are far tougher to diagnose and treat. Amy Standen reports on one under-diagnosed brain disease, frontotemporal dementia, and its often baffling effects.

It's that time of year again. Temperatures are hot, so we're cranking up the air conditioning. That means more electricity from the power grid, more greenhouse gas emissions, more global warming and -- with warmer temperatures -- even more air conditioning! There are a few ways to halt this vicious cycle, one of which starts with a makeover for the machine itself.

When you order your double latte to-go at the corner coffee shop, the empty cup and lid may end up in a giant pit of plastic ocean litter off the coast of California. Some cities and counties are so concerned about the garbage in the so-called North Pacific Gyre that they've passed ordinances to try to limit the amount of plastic in our lives.

People with pseudobulbar affect -- a neurological condition common in patients with Lou Gehrig's disease -- have overwhelming emotions at inappropriate times. Scientists at UC San Francisco believe that by putting these people into MRI scans, they can learn more about how emotions are created and controlled in the human brain - and what happens when those systems break down.

Melting glaciers, rising temperatures and droughts - all are impacts of global warming. What receives much less attention is the toll that climate change is taking on the health of our oceans. The sea, it turns out, absorbs carbon dioxide emissions, which are causing it to become more acidic. Changing pH levels threaten the entire marine food chain from coral reefs to salmon.

Forget solar panels - how about having your own wind turbine? Your own solar thermal power generator? Your own geothermal well? San Francisco homeowners are some of the first to experiment with these DIY home-energy technologies, and they are getting some help from the city to do it.