Engineers of "lead-free" electronics have been more concerned about circuit failure than about environmental costs. My own criticism has been that they are replacing lead - 85% recycled content - with silver and tin, which are mining nightmares. If you are going to protect the lined landfill at the expense of the coral reefs and rainforests, then maybe you should use baby seal pelts as packaging - they are organic and reuseable.
The buzz in the engineering community is whether "tin whiskers", these pesky little strands that naturally creep away from the printed line of solder, like rust naturally accumulates on iron, are going to short circuit electronics. Several engineers are readying the Toyota recall press daily to see whether Toyota - an early adapter of lead-free solder - is the first casualty.
NASA and medical devices and airlines have been seeking "exemptions" from lead-free solder rules. I'll post more when I know something.
I am not a grouch. I just want to limit the "friendly fire" of environmentalists. The environment is too dear to endure self inflicted wounds for the sake of political correctness. If our policies are correct, they will be stronger for having endured critiques.