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Virtual War by Gloria Skurzynski.

Ender's Game or Ender's Shadow by Orson Scott Card In 25 words or less, children playing video war games save the world from destruction.

Armaggedon Summber by Bruce Coville and Jane Yolen

Eva by Peter Dickinson

Gathering Blue by Lois Lowry

Virtual War by Gloria Skurzynski

CURE by Levitan

William Gibson's *Idoru*.  Actually anything by William Gibson would be good.

The new book Stuck in Neutral by Terry Trueman might be a good choice.

"Terminal Experiment," by Robert Sawyer. It's a sci-fi novel, but only just,  set in the first decade of the 21st century. Sawyer is Canadian too.  It's about a fellow who wants to find out if there is a soul. So he sets up a computer experiment to get the answer.

The Chosen , Bean Trees Ender's Game and Romeo and Juliet.

This isn't a novel, but Ray Bradbury's short story, "The Veldt", seems to be a hit for the factors you list!  Our district has a video version,
too; it is exactly the same as the story, but it's fun for the kids to see it on film.  (I teach 8th grade).

Isaac Asimov's Robot  novels with his character, Daneel Olivaw

Martian Chronicles by Bradbury

Clive Cussler

Clancy Net Force novels

I, Robot by Isaac Asimov is a classic that deals with some of those issues.