Read the award-winning climate fiction story, Luna. 

What Kim Stanley Robinson said about it: 

"Man loves partner, also an orca female, pregnant but maybe last of her kind. Colleague pregnant also. Man feels end times have come, urges orca to go north, then agrees to go with wife, north to Alaska where her work is taking her. Persisting, people and orcas both; sadness; death, also birth. Simple elements, powerfully told."