Whitespace
rm inadvertently committed .DS_Store
Climate: rm smoke from factory, make PNG

[#65235664]
Climate: use NGS factory image

[#65235664]
Climate: just show 0 or 1 factories

[#65235664]

This shouldn't affect the model behavior at all, but the intended visual effect of having multiple factories when the emission rate is high, just didn't work with the NGS art.
Climate: Add NGS art for volcano

[#65235664]

Making volcanoes an agent breed for consistency with factories, even though there's only one volcano ever and it's more a static picture than an agent.
Climate: rm image-loading vs. compilation race
Climate: Use NGS cloud image

[#65235664]
Fracking: fix graph-key size issues, add black