The No. 1 crisis facing San Francisco today is the skyrocketing cost of housing. As high prices push people out, the City of Oakland faces a wave of new arrivals — and new challenges. Here's how we got into this situation, and what we can do about it.

Since rolling out on August 29, Bay Area Bike Share has logged an estimated 21,138 bicycle trips and 4,380 casual members. Not bad for a pilot program. But in order for it to last — and grow — it’s important to ask how we can translate this initial success into a long-term one.

Climate scientists have raised concerns that the latest report from the U.N. Intergovernmental Panel on Climate Change is "too conservative," referring to its lowered projections on the range of future warming based on a slight lack of temperature increase over the last decade. Despite this possibly encouraging bit of news, the IPCC's fifth major assessment continues to report unequivocal warming due to human causes.

Earlier this year a new ordinance requiring energy audits for existing commercial buildings in San Francisco went into effect. The audits identify upgrades a property owner can make to improve overall building efficiency. So far, the first 195 building audits have identified 32 gigawatt-hours of potential annual energy savings, with a value of $6 million. With thousands more audits slated to happen over the next two years, what kind of savings might we expect to see from this simple reporting requirement?